## Abstract

Null object (NO) constructions in Korean and Japanese have received different accounts: as (a) argument ellipsis (Oku 1998, S. Kim 1999, Saito 2007, Sakamoto 2015), (b) VP-ellipsis after verb raising (Otani and Whitman 1991, Funakoshi 2016), or (c) instances of base-generated pro (Park 1997, Hoji 1998, 2003). We report results from two experiments supporting the argument ellipsis analysis for Korean. Experiment 1 builds on K.-M. Kim and Han’s (2016) finding of interspeaker variation in whether the pronoun ku can be bound by a quantifier. Results showed that a speaker’s acceptance of quantifier-bound ku positively correlates with acceptance of sloppy readings in NO sentences. We argue that an ellipsis account, in which the NO site contains internal structure hosting the pronoun, accounts for this correlation. Experiment 2, testing the recovery of adverbials in NO sentences, showed that only the object (not the adverb) can be recovered in the NO site, excluding the possibility of VP-ellipsis. Taken together, our findings suggest that NOs result from argument ellipsis in Korean.

## 1 Introduction

One of the defining grammatical properties of East Asian languages, such as Korean and Japanese, is the possibility of dropping object arguments in addition to subject arguments. This phenomenon is attested in the so-called null object construction in Korean, as exemplified in (1), where a transitive verb with no overtly expressed object (marked with [e] as a theory-neutral notation) appears in the second conjunct of the coordinate structure.

(1)

• Appa-nun sayenni-lul coaha-yss-ciman, emma-nun [e] sileha-yess-ta.

• Dad-TOP New.Sister-ACC like-PAST-CONJ Mom-TOP dislike-PAST-DECL

• (Lit.) ‘Dad liked New Sister, but Mom disliked.’

The object of sileha ‘dislike’ is missing, but it is readily understood as corresponding to the phonologically overt object in the first conjunct, sayenni ‘New Sister’. This is in contrast with English, which does not allow null objects; the literal translation of (1) is not acceptable. The existing analyses for null object constructions in the East Asian languages can be grouped into at least three camps: (a) the null pronominal analysis, (b) the argument ellipsis analysis, and (c) the verb-stranding VP-ellipsis analysis.

The first analysis postulates a phonologically null pronoun (pro) base-generated in the object position [e] (Cole 1987, Park 1994, 1997, Hoji 1998, 2003, Li 1998, Yoon 2004, Ahn and Cho 2010, 2011a,b, S.-H. Kim 2010, Moon 2010, Bae and Kim 2012). The null pro refers to a contextually salient entity (e.g., New Sister in (1)), introduced into the discourse by the overt object in the first clause, similar to the behavior of an overt pronoun such as kunye ‘she’.

The second analysis claims that null objects are the result of an operation called argument ellipsis (Oku 1998, S. Kim 1999, Saito 2003, 2007, Takahashi 2007, 2008, Cheng 2011, 2013, Otaki 2011, 2014, Takita 2011, Um 2011, J.-S. Kim 2012, Park 2013, Saito and An 2014, Sakamoto 2015, 2016, 2017). That is, a full-fledged DP constituent is constructed in the object position in (1), but is subsequently elided under identity with an overt DP in the corresponding object position in a preceding clause.1

The third analysis involves VP-ellipsis preceded by overt movement of the main verb out of the VP to Tense (Huang 1987, 1988, 1991, Otani and Whitman 1991, Pan 2002, E.-J. Lee 2005, Funakoshi 2014, 2016, W. Lee 2016, Fujiwara 2017). In (1), for instance, all the elements within the VP in the second conjunct, including the DP object, undergo ellipsis, while the verb, sileha ‘dislike’, which has been raised to Tense, is “stranded” and thus is overtly realized. Under the verb-stranding VP-ellipsis analysis, then, the null object site [e] is equivalent to an articulated VP constituent, although it does not appear to be so on the surface.2

The three competing approaches can be distinguished by their assumptions regarding the following two parameters: (a) whether null objects contain unpronounced internal structure, and (b) whether null objects correspond to DPs or “null VPs in disguise” (as Huang (1988) terms them), as summarized in table 1.

Table 1

Syntactic status of null objects

Source of null objects(a) Internal structure?(b) [e] is DP or VP?
Null pronominal Absent DP
Argument ellipsis Present DP
Verb-stranding VP-ellipsis Present VP
Source of null objects(a) Internal structure?(b) [e] is DP or VP?
Null pronominal Absent DP
Argument ellipsis Present DP
Verb-stranding VP-ellipsis Present VP

The primary purpose of this article is to present novel empirical data obtained from two experimental studies demonstrating that some instances of Korean null objects should be analyzed as argument ellipsis. In Experiment 1, the availability of sloppy identity readings for null objects was examined in conjunction with interspeaker variability in the interpretation of the pronoun ku, which offers a novel probe for diagnosing the presence of internal syntactic structure at the null object site. We demonstrate that the findings of Experiment 1 could only be obtained if the null object constructions tested result from the ellipsis of a constituent with full-fledged structure, thus undermining the view that Korean null objects are pronominal. Experiment 2 tested the recoverability of adjuncts to diagnose the size of ellipsis: whether it is a DP object (argument ellipsis) or a VP containing the DP object (verb-stranding VP-ellipsis). The findings showed that adjuncts cannot be recovered, which supports the claim that the null object in Korean results from argument ellipsis, not verb-stranding VP-ellipsis.

## 2 Experiment 1

### 2.1 Research Question and Predictions

The first and most frequently cited argument in defense of the ellipsis strategy for null objects in East Asian languages is that sloppy identity readings are available in some null object constructions, as illustrated in the Korean example in (2). Note that the antecedent sentence in (2A) has a DP object containing the long-distance anaphor caki ‘self ’ as a possessor.

(2)

The possibility of both a strict and a sloppy reading poses a nontrivial challenge to the “uniform pro-theory” (Sato 2014:2). If the null object argument in (2B) were simply an empty pronominal, then contrary to fact the sentence should not be able to yield the sloppy identity reading, on a par with the sentence in (3) in the same context, which contains kunye ‘she’ in the object position.

Here, the overt pronoun can only be interpreted referentially and thus only allows the strict identity reading, when preceded by (2A).

(3)

To accommodate the availability of sloppy interpretation in null object constructions, a number of syntacticians have argued that the relevant null objects should be analyzed as resulting from some kind of ellipsis operation, which might be either argument ellipsis (Oku 1998, S. Kim 1999, Saito 2003, 2007, Takahashi 2007, 2008, 2013, Sakamoto 2015, 2016) or verb-stranding VP-ellipsis (Huang 1987, Otani and Whitman 1991, E.-J. Lee 2005, Funakoshi 2014, 2016). On either ellipsis approach, the null object sentence in (2B) would involve a DP with internal syntactic structure that includes the possessive anaphor caki-uy ‘self-GEN’, elided under identity with its overt antecedent. The sloppy identity reading would then be attributed to standard mechanisms, in which the elided anaphor is bound by its clausemate subject, Cinswu.

Another representative argument made to substantiate the ellipsis analysis is based on the observation that some null objects yield “quantificational readings” (as Takahashi (2008) terms them). Consider the Korean null object construction in (4B). The antecedent sentence in (4A) contains a nominal object modified by the numeral quantifier sey myeng(-uy) ‘three CL(-GEN)’.

(4)

As indicated above, the null object sentence in (4B) has two interpretations: the quantificational reading, in which the set of singers that Cinswu likes does not need to be identical to the set that Minswu likes, and the “E-type reading” (e.g., Evans 1980), in which the singers that Cinswu likes must be the same as the ones that Minswu likes. Now compare (4B) with (5), where the object argument site is filled with an overt pronominal.

(5)

When (5) is preceded by (4A), the pronoun kutul ‘they’ can only be anaphorically linked to the singers that Minswu likes. Thus, the sentence yields only the E-type reading. Given this, the fact that (4B) does allow the quantificational reading (as well as the E-type reading) would be mysterious if a null pronoun occupied the object argument position. On the other hand, the ellipsis analysis can easily capture the availability of the quantificational reading of the null object. Under either the argument ellipsis analysis or the verb-stranding VP-ellipsis analysis, (4B) involves an (indefinite) object DP containing sey myeng(-uy) ‘three CL(-GEN)’, which undergoes ellipsis under identity with its overt antecedent. The quantificational reading arises quite simply because there is an elided quantifier in the null object sentence.

However, the ellipsis analyses discussed so far have been rejected by Hoji (1998, 2003) and subsequent researchers (Li 1998, Tomioka 1998, 2003, 2014, Kurafuji 1999, Ahn and Cho 2010, 2011a,b, Moon 2010, Bae and Kim 2012, Kasai 2014), who have argued that the examples can all be accounted for by a null pronominal analysis. Hoji (1998) argues that null pronominals in East Asian languages, including Korean, can be construed as indefinite as well as definite (cf. Jaeggli 1986, Rizzi 1986). According to Hoji, the null object position [e] in (2B) is occupied by a pro that can be anaphorically linked to an indefinite argument, emeni ‘mother’, which corresponds to the noun head of the full DP object in the antecedent sentence in (2A). Under this “indefinite pro analysis,” then, the null object sentence in (2B) is taken to be semantically equivalent to the sentence in (6) containing the lexically overt object, emeni ‘mother’.

(6)

• Cinswu-to emeni-lul piphanha-yess-ta.

• Cinswu-also mother-ACC criticize-PAST-DECL

• (Lit.) ‘Cinswu criticized a mother, too.’

As noted by Saito (2007:206), the interpretation of the sentence in (6) is not exactly identical to the sloppy identity reading given in (2), ‘Cinswu criticized his own mother, too’. Nevertheless, this sentence is (pragmatically) consistent with a sloppy identity reading and can thus be truthfully uttered in such a situation or discourse context. Hoji (1998) concludes that the availability of the sloppy identity reading (in his terms, the “sloppy-like reading”) for the null object sentence in (2B) can be analyzed in terms of pro, without recourse to an elided structure embedding the bound variable element caki-uy ‘self-GEN’.

As for the quantificational readings for null objects introduced in (4), Ahn and Cho (2011a,b) suggest that (4B) involves an indefinite pro and thus is equivalent to the sentence in (7), where the object position is filled with the indefinite nominal kaswu ‘singer’; the quantificational reading in (4B) is then generated via pragmatic inference.

(7)

• Cinswu-to kaswu-lul coaha-n-ta.

• Cinswu-also singer-ACC like-PRES-DECL

• (Lit.) ‘Cinswu likes a singer, too.’

As it stands, then, both the ellipsis and the null pronominal approaches can account for the availability of the sloppy reading in the null object construction. In what follows, we present novel empirical data from our Experiment 1 that support the ellipsis analysis for Korean. We use the availability of sloppy readings to identify the syntactic nature of Korean null objects, with the aid of the overt third person pronoun ku ‘he’. The fundamental logic of Experiment 1 is based on the discovery about ku in K.-M. Kim, Han, and Moulton 2015 and K.-M. Kim and Han 2016 that there exists substantial interspeaker variation in the bindability of ku. That is, with regard to the interpretation of quantificational sentences such as (8), an individual Korean speaker will either consistently allow a bound variable reading for ku or consistently not allow such a reading.

(8)

• Motwu-ka ku-uy cim-ul nalu-ess-ta.

• everyone-NOM he-GEN stuff-ACC move-PAST-DECL

• ‘Everyone moved his stuff.’

• ‘Each person moved his own stuff.’

• ‘Everyone moved one particular person’s stuff.’

For a referential interpretation of ku, there is no interspeaker variation: ku can readily take as its antecedent a referential matrix subject (e.g., Minswu in (9)) as long as a relevant context is provided, although it often prefers to have a discourse antecedent.

(9)

• Minswu-ka ku-uy cim-ul nalu-ess-ta.

• Minswu-NOM he-GEN stuff-ACC move-PAST-DECL

• ‘Minswu moved his stuff.’

• ‘Minswu moved his own stuff.’

• ‘Minswu moved one particular person’s stuff.’

In Experiment 1, we use the interspeaker variation for bound ku as a probe into the correct representation of null objects. If null objects involve the ellipsis of syntactic structure that matches an antecedent, we would expect that when the pronoun ku is elided, it will have the same interpretive options as unelided ku for any given speaker. It is standardly assumed that sloppy pronouns in ellipsis contexts and bound variable pronouns in quantificational contexts are subject to the same λ-binding mechanism (Heim and Kratzer 1998, Büring 2005). Therefore, we expect to find interspeaker variation in the acceptance of sloppy readings just as in the acceptance of bound variable readings in quantificational sentences. Crucially, we should be able to observe a correlation between the distribution of the two readings: an individual speaker’s acceptance of the sloppy reading in null object sentences should be predictable from his or her acceptance of the bound variable reading in quantificational sentences (and vice versa). That is, speakers who allow the bound variable reading of ku in quantificational sentences would be expected to accept the sloppy reading in null object sentences, while speakers who do not allow the bound variable reading would be expected to reject the sloppy reading. Alternatively, if null objects are simply null elements without internal, elided structure, we do not expect such a correlation. In the latter case, sloppy readings might arise for all speakers via a mechanism unrelated to the bindability of ku—Hoji’s “sloppy-like” interpretations, for instance. The central research question is summarized in (10).

(10)

• Research question

• Does the distribution of sloppy readings of null objects follow from the distribution of quantified bound variable pronouns in Korean?

To answer this research question, we examined the availability of sloppy identity readings in null object constructions such as (11) in comparison with the availability of bound variable readings in quantificational sentences such as (8).

(11)

Given a context where the first conjunct in (11) is understood as ‘Minswu moved Minswu’s stuff’, the ellipsis and null pronominal analyses make different predictions regarding the relation between the distribution of the sloppy identity readings for the null object constructions and the quantificational binding of ku. This is so since the ellipsis analysis assumes the null object to have syntactically represented internal structure while the null pronominal analysis does not.3

### 2.2 Methodology

Forty adult native speakers of Korean participated in the experiment. Most were university students in South Korea. They were paid $10 (Canadian) each as compensation for participating. #### 2.2.2 Task A truth-value judgment task (Crain and Thornton 1998) was employed. On a computer screen, participants were presented with sentences describing a context, followed by a target sentence. They were then asked to judge whether the target sentence truthfully described the given context by clicking 1 for True and 0 for False (see figure 1). Figure 1 Screenshot of a test trial in Experiment 1 Figure 1 Screenshot of a test trial in Experiment 1 #### 2.2.3 Design and Materials Each target sentence was either a null object construction such as or a quantificational sentence such as (8), and each context was biased toward a bound or referential reading in the quantificational sentences, and a sloppy (i.e., bound) or strict reading in the null object sentences. Thus, two factors were crossed to create four experimental conditions: Sentence Type (null object vs. quantificational) × Context Type (bound vs. referential). A sample set of test items is given in (12)–(15). For space reasons, the context sentences are given in English. (12) • Null object–bound (sloppy identity reading) condition • Minswu, Kiswu, and Cinswu were moving to a new dorm. Minswu moved Minswu’s stuff. Kiswu also moved Kiswu’s stuff. • Minswu-ka ku-uy cim-ul nalu-ess-ko, Kiswu-to [e] nalu-ess-ta. • Minswu-NOM he-GEN stuff-ACC move-PAST-CONJ Kiswu-also move-PAST-DECl • ‘Minswu moved his stuff, and Kiswu moved, too.’ (13) • Null object–referential (strict identity reading) condition • Minswu, Kiswu, and Cinswu were moving to a new dorm. Minswu moved Minswu’s stuff. Kiswu also moved Minswu’s stuff. • Minswu-ka ku-uy cim-ul nalu-ess-ko, Kiswu-to [e] nalu-ess-ta. • Minswu-NOM he-GEN stuff-ACC move-PAST-CONJ Kiswu-also move-PAST-DECL • ‘Minswu moved his stuff, and Kiswu moved, too.’ (14) • Quantificational-bound condition • Minswu, Kiswu, and Cinswu were moving to a new dorm. Minswu moved Minswu’s stuff. Kiswu also moved Kiswu’s stuff. Cinswu also moved Cinswu’s stuff. • Motwu-ka ku-uy cim-ul nalu-ess-ta. • everyone-NOM he-GEN stuff-ACC move-PAST-DECL • ‘Everyone moved his stuff.’ (15) • Quantificational-referential condition • Minswu, Kiswu, and Cinswu were moving to a new dorm, waiting for Thayswu to come. Minswu moved Thayswu’s stuff. Kiswu also moved Thayswu’s stuff. Cinswu also moved Thayswu’s stuff. • Motwu-ka ku-uy cim-ul nalu-ess-ta. • everyone-NOM he-GEN stuff-ACC move-PAST-DECL • ‘Everyone moved his stuff.’ In (12), the context is consistent with the sloppy identity reading for the target null object construction, which would arise, according to the ellipsis analysis, from elided ku being a bound pronoun, while in (13), the context is consistent with the strict identity reading for the target null object construction, which would be attributed to ku serving as a referential pronoun. In (14), the context is consistent with the bound variable reading for ku in the target quantificational sentence, while in (15), the context is consistent with the referential reading for ku in the target quantificational sentence. Following the pattern illustrated in (12)–(15), 16 sets of test items were constructed, resulting in 64 test items (16 items for each of the four experimental conditions). These items were then assigned to four presentation lists according to a Latin square design, such that each list contained four items in each condition. The same 40 filler items (some of which are given in (16)–(18)) were then added to each list. (16) • Referential filler • Minswu, Kiswu, and Cinswu were taking a rest after exercising. Minswu drank Minswu’s beverage. • Minswu-ka ku-uy umlyoswu-lul masi-ess-ta. • Minswu-NOM he-GEN beverage-ACC drink-PAST-DECL • ‘Minswu drank his beverage.’ (17) • Null object–“object mismatch” filler • Minswu, Kiswu, and Cinswu were taking a rest after exercising. Minswu drank a beverage. Kiswu drank water. • Minswu-ka umlyoswu-lul masi-ess-ko, Kiswu-to [e] masi-ess-ta. • Minswu-NOM beverage-ACC drink-PAST-CONJ Kiswu-also drink-PAST-DECL • ‘Minswu drank a beverage, and Kiswu drank, too.’ • (constructed on the basis of J.-S. Kim’s (2012:38–39) examples) (18) • Null object–“modifier mismatch” filler • Minswu, Kiswu, and Cinswu were taking a rest after exercising. Minswu drank a cold beverage. Kiswu drank a warm beverage. • Minswu-ka chaka-wun umlyoswu-lul masi-ess-ko, Kiswu-to [e] • Minswu-NOM cold-ADN beverage-ACC drink-PAST-CONJ Kiswu-also masi-ess-ta. • drink-PAST-DECL • ‘Minswu drank a cold beverage, and Kiswu drank, too.’ (constructed on the basis of J.-S. Kim’s (2012:38) examples) #### 2.2.4 Procedure The experiment was administered using PsychoPy (Peirce 2007). Sixteen test trials (four trials per condition) and 40 filler trials were presented to the participants in a uniquely generated random order. #### 2.2.5 Findings Figure 2 summarizes mean acceptance rates (assignment of 1, True) by condition: 33% in the quantificational-bound condition, 31% in the null object–bound (sloppy identity reading) condition, 82% in the quantificational-referential condition, and 79% in the null object–referential (strict identity reading) condition. A generalized linear mixed-effects model (logistic/binomial regression model) was fit to the data using the “glmer” function of the “lme4” package (Bates, Maechler, and Bolker 2012) in R (R Development Core Team 2012), to analyze participants’ responses as a function of sentence type and context type, with participant and item included as random effects. The random effects structure specified only random intercepts. The analysis revealed a main effect of context type (coefficient estimate = 2.46, SE = .29, z = 8.44, p < .001): regardless of sentence type, speakers were significantly more likely to accept the referential reading than the bound reading. However, the analysis revealed no main effect of sentence type, and no interaction between context type and sentence type: speakers were equally likely to accept bound readings for the quantificational sentences and the null object constructions; speakers were also equally likely to accept referential readings for both sentence types. Figure 2 Mean rates of acceptance and standard errors in Experiment 1 Figure 2 Mean rates of acceptance and standard errors in Experiment 1 To understand the distribution of responses in the bound conditions, we assigned each participant to one of three groups on the basis of his or her mean individual acceptance rates in the quantificational-bound condition and the null object–bound (sloppy identity reading) condition: accept (≥ 75% acceptance: assignment of 1 to three or four target sentences), ambivalent (= 50% acceptance: assignment of 1 to two target sentences), and reject (≤ 25% acceptance: assignment of 1 to zero or one target sentence). A bimodal distribution of the participants’ responses was observed in each bound condition, as illustrated in figure 3: participants tended to either always accept or always reject the quantificational binding interpretation for ku; participants also tended to either always accept or always reject the sloppy readings for the null object constructions. Figure 3 Distribution of responses in the quantificational-bound and null object–bound (sloppy identity reading) conditions in Experiment 1 Figure 3 Distribution of responses in the quantificational-bound and null object–bound (sloppy identity reading) conditions in Experiment 1 Given that interspeaker variation was found in the quantificational-bound condition and the null object–bound condition, a linear regression analysis was carried out to examine the correlation between the participants’ mean acceptance rates in the two bound conditions. The analysis revealed a strong correlation (R2 = .62, t = 7.93, p < .001), as illustrated in figure 4. This result indicates that an individual speaker’s acceptance of the sloppy readings for the null object constructions is predictable from his or her acceptance of the bound variable readings for the quantificational sentences (and vice versa).4 Taken together, these results suggest that participants who allowed the quantificational binding of ku accepted the sloppy identity readings for the null object constructions, and those who did not allow the quantificational binding of ku rejected the sloppy identity readings.5 Figure 4 Correlation between mean acceptance rates in the quantificational-bound and null object–bound (sloppy identity reading) conditions in Experiment 1 Figure 4 Correlation between mean acceptance rates in the quantificational-bound and null object–bound (sloppy identity reading) conditions in Experiment 1 ### 2.3 Discussion The findings of Experiment 1 present empirical evidence that is inconsistent with the view that null objects in Korean are all instances of phonologically empty pronominals. As discussed in section 2.1, if the null object in sentences such as (11) were indeed a base-generated (indefinite) pro—an atomic element without the internal structure to host the pronoun ku—then the availability of the relevant sloppy identity readings would not be expected to correlate with the availability of the bound variable construal of ku in sentences such as (8). Contrary to the prediction of the null pronominal analysis, however, Experiment 1 found a strong correlation between the distribution of the sloppy identity readings and the quantificational binding of ku. It was demonstrated that native speakers of Korean sort into two distinct groups: those who allow both the sloppy identity readings for null objects (as in (11a)) and the quantificational binding of ku (as in (8a)), and those who do not allow either. This correlation follows from an ellipsis account, where the sloppy reading is derived by the binding of an elided ku; that option, however, depends on the speaker’s grammar for ku, something that is independently verified by the speaker’s ability to use ku as a quantifierbound pronoun.6 Our claim that the correlation between the bindability of ku and the availability of a sloppy reading can be used to diagnose ellipsis is corroborated by the results from the studies in K.-M. Kim, Han, and Moulton 2015 of the nonelliptical VP anaphor in Korean, kuleha ‘do so’, illustrated in (19). (19) Those studies confirm that kuleha does not involve ellipsis but is an (overt) VP proform: in contrast to what would be expected of ellipsis, constructions like (19) do not allow extraction from within the anaphor site. Further, the availability of the sloppy reading in these VP anaphora constructions is not correlated with the availability of the quantificational binding interpretation for ku, unlike the case of null objects shown in Experiment 1. Results reported in K.-M. Kim, Han, and Moulton 2015 show that while considerable interspeaker variation existed in the acceptance of the quantificational binding of ku, just as in Experiment 1, (nearly) all participants unequivocally accepted the sloppy readings for the VP anaphors. Given these findings, if null objects were indeed instances of empty pronouns, then uniform and high acceptance of the sloppy readings for the null object constructions in Experiment 1 would have been expected, just as in the VP anaphora sentences in K.-M. Kim, Han, and Moulton 2015. However, this expectation was not borne out by the results of Experiment 1, which revealed a 31% acceptance rate in the null object–bound (sloppy reading) condition and a 33% acceptance rate in the quantificational-bound condition, derived from about one-third of the participants who consistently accepted the target sentences in the two conditions. This further supports the claim that the null object constructions tested in Experiment 1 involve ellipsis for the most part, not pro.7 ## 3 Experiment 2 ### 3.1 Research Question and Predictions In section 2, we provided novel empirical evidence that some cases of null objects in Korean should be attributed to the ellipsis of a constituent with full-fledged internal syntactic structure. However, a crucial question remains unanswered: is the elided element a DP object (argument ellipsis) or a VP containing the DP object (verb-stranding VP-ellipsis)? A well-known diagnostic for identifying the “size” of ellipsis is the (un)availability of the “null adjunct reading” (as Hayashi (2015) terms it) for null object constructions such as (20), where the antecedent sentence in (20A) contains an adverb and the null object sentence in (20B) is negated. (20) • Minho-ka ppali mwul-ul masi-ess-ta. Minho-NOM quickly water-ACC drink-PAST-DECL ‘Minho drank water quickly.’ • Kiho-nun [e] masici-an-ass-ta. Kiho-TOP drink-NEG-PAST-DECL (Lit.) ‘Kiho did not drink.’ (constructed on the basis of Oku’s (1998:172) Japanese examples) The verb-stranding VP-ellipsis analysis and the argument ellipsis analysis make different predictions with respect to the “recovery” of an adjunct in the Korean null object construction in (20). Under the verb-stranding VP-ellipsis analysis, the null object sentence in (20B) should mean that Kiho did not drink water quickly (thus implying that Kiho drank water, but he did not do so quickly). This is so since the elided element in [e] would correspond to a VP structure (after the verb raises out of the VP to Tense), which contains the manner adverb ppali ‘quickly’ as well as the DP object mwul ‘water’, as represented in (21).8 (21) Kiho-TOP [VP quickly [DP water ACC] tv ](= [e]) drinkv-NEG-PAST-DECL According to the argument ellipsis analysis, on the other hand, such a null adjunct reading should not be available, because only the DP object mwul ‘water’ (not the adverb ppali ‘quickly’) would undergo ellipsis in [e], as in (22); thus, the whole null object sentence in (20B) should receive the object-only reading that Kiho did not drink water at all. (22) Kiho-TOP [DP water ACC](= [e]) drink-NEG-PAST-DECL To the best of our knowledge, the dominant view in the literature of East Asian languages has been that null object sentences such as (20B) are acceptable only under the interpretation in which the DP object alone is semantically “recovered” in [e] (e.g., Park 1997, Oku 1998, Takahashi 2008, Cheng 2011, J.-S. Kim 2012), thus supporting the argument ellipsis analysis. However, the verb-stranding VP-ellipsis analysis has been revitalized by Funakoshi (2016:119), who argues that the null adjunct reading becomes much more available, at least for some speakers, if the antecedent clause and the null object clause are combined by a contrasting conjunction connective, as illustrated in the following Japanese example: (23) • Taroo-wa teineini kuruma-o arat-ta kedo, John-wa [e] araw-anak-atta. • Taroo-TOP carefully car-ACC wash-PASTbut John-TOP wash-NEG-PAST • (Lit.) ‘Taroo washed the car carefully, but John did not wash.’ • (adapted from Funakoshi 2016:119, (16)) According to Funakoshi, the null object clause in (23) has the meaning ‘John washed the car, but not in a careful manner’, which can be derived if the adverb teineini ‘carefully’ is recovered in [e], along with the object kuruma ‘car’. Funakoshi also observes that the null adjunct reading is available even without the conjunction connective, if a context makes the null adjunct reading appropriate. He provides the following Japanese example to illustrate this point: (24) • Taroo and Hanako washed their parents’ cars to get allowance. Taroo was thorough in his work while Hanako was not. • Taroo-wa teineini kuruma-o arat-ta. Taroo-TOP carefully car-ACC wash-PAST ‘Taroo washed the car carefully.’ • Hanako-wa [e] araw-anak-atta. Hanako-ga arat-ta ato-no kuruma-wa Hanako-TOP wash-NEG-PAST Hanako-NOM wash-PAST after-GEN car-TOP kitanak-atta. dirty-PAST (Lit.) ‘Hanako did not wash. The car that Hanako washed was dirty.’ (Funakoshi 2016:119, (17)) Funakoshi claims that the null object sentence in (24B) can mean that Hanako did not wash the car carefully, with the aid of the context and the follow-up sentence that promotes the null adjunct reading. Building upon Funakoshi’s insights and arguments, we conducted an experimental study to address the following research question, in order to investigate the size of ellipsis involved in Korean null object constructions: (25) • Research question • Does the null object construction in Korean allow the null adjunct reading? The verb-stranding VP-ellipsis analysis predicts that the null object sentences will allow the null adjunct reading because the VP structure containing an adverb, created after verb raising, can be recovered. In contrast, the argument ellipsis analysis predicts that the null adjunct reading will be unavailable because only the object, and nothing else, can be recovered. ### 3.2 Methodology #### 3.2.1 Participants Thirty adult native speakers of Korean, none of whom participated in Experiment 1, participated in Experiment 2. Most were university students in South Korea. They were paid$10 (Canadian) each as compensation for participating.

A truth-value judgment task was employed, as in Experiment 1. Participants were presented with sentences describing a context, along with images matching the description; these were followed by a target sentence. As in Experiment 1, participants clicked on 1 for True and 0 for False to indicate whether the target sentence truthfully described the given context.

#### 3.2.3 Design and Materials

A target sentence was presented in a context in which two animal characters are in a contest with different prizes, performing the same action in different manners, as illustrated in (26). The target sentence contained a clause describing the action of one of the animals, a contrasting conjunction connective, and a second clause describing the action of the other animal. The second clause of each target sentence contained a verb that is obligatorily transitive in Korean and was formed with either a null object (26a), an object (26b), or an object and an adverb (26c). The experiment thus tested one factor, sentence type, with three levels, creating three conditions: NO (test sentences have no object and no adverb), object (test sentences have an object but no adverb), and object-adverb (test sentences have an object and an adverb).

(26)

#### 3.2.4 Procedure

Like Experiment 1, Experiment 2 was administered using PsychoPy. Twelve test trials (four trials per condition) were presented to the participants, in accordance with a Latin square design, in a uniquely generated random order.

#### 3.2.5 Findings

The verb-stranding VP-ellipsis analysis predicts NO sentences like (26a) to be as felicitous in the given context as object-adverb sentences like (26c) because the VP structure containing ppalukey ‘quickly’, created after verb raising, can be recovered in the null object site. In contrast, the argument ellipsis analysis predicts NO sentences like (26a) to be as infelicitous as object sentences like (26b) because only the object patak-ul ‘floor-ACC’, and nothing else, can be recovered. These would both then be judged false, since Lion did do some sweeping. We found that NO sentences predominantly patterned with object sentences and not object-adverb sentences, as can be seen in figure 5, which summarizes acceptance rates by condition: NO = 7%, object = 4%, and object-adverb = 92%.

Figure 5

Mean rates of acceptance and standard errors in Experiment 2 (NO = no object and no adverb, Obj = object, ObjAdv = object and adverb)

Figure 5

Mean rates of acceptance and standard errors in Experiment 2 (NO = no object and no adverb, Obj = object, ObjAdv = object and adverb)

A generalized linear mixed-effects model (logistic/binomial regression model) fitted to the data, with sentence type as a fixed effect and participant and item as random effects (whose structure was specified with random intercepts) revealed a main effect of sentence type: while the acceptance rates in the object and NO conditions did not differ, the acceptance rate in the object-adverb condition was significantly higher than the acceptance rate in the NO condition (coefficient estimate = 6.67, SE = .87, z = 7.65, p < .001). Pairwise comparison using Tukey’s test also revealed that while speakers were equally unlikely to accept sentences in the NO and object conditions, they were significantly more likely to accept sentences in the object-adverb than the NO ( p < .001) or the object ( p < .001) condition.

### 3.3 Discussion

In Experiment 2, we presented test sentences in contexts favoring the null adjunct reading, heeding suggestions by Funakoshi (2016). Nonetheless, the findings show that in interpreting null object sentences in Korean, while the object argument is easily recovered, an adjunct is nearly impossible to recover—that is, the null adjunct reading is unavailable. Thus, the findings verify the predictions of the argument ellipsis analysis, but are incompatible with those of the verb-stranding VP-ellipsis analysis.

A question remains: namely, why the null adjunct reading becomes available to some speakers in similarly constructed null object sentences in Japanese, as reported by Funakoshi (2016), unlike in Korean, as shown by the findings in Experiment 2. While we must leave this question for future research, one possibility is that potential differences in the position of the verb in the clause structure in the two languages play a major role in whether the verb-stranding VP-ellipsis analysis is available. Alternatively, there might be variation in the extent to which a language elides structures with traces.

## 4 Conclusion

In this article, we have presented two experiments designed to determine the correct analysis for null objects in Korean along two parameters: do they involve ellipsis or not, and if they involve ellipsis, is an argument or a VP remnant elided? Our findings suggest that null objects are elided arguments. As evidence that null objects in Korean involve argument ellipsis, and not VP-ellipsis, we found that null object constructions cannot be construed as involving the elision of a VP adjunct.

The evidence for ellipsis came from a novel use of interspeaker variation to probe for the existence of elided syntactic structure. We found a correlation between a speaker’s acceptance of quantifier-bound ku and his or her acceptance of sloppy readings for null objects with antecedents containing ku. This correlation is expected if null objects contain complex internal syntactic structure with an elided ku that has the same grammatical properties, for any given speaker, as the overt ku. The correlation is not expected if null objects are atomic, unanalyzable null proforms, whose sloppy readings arise in a way that does not depend on a given speaker’s interpretation of ku. While explorations of “microparametric” variation in the domain of morphosyntax have been fruitful for syntactic theory (see Brandner 2012 for an overview), the present study shows how interspeaker semantic variation can be profitably exploited to address theoretical questions.

## Notes

1 Argument ellipsis has also been argued to occur in South Asian languages such as Bangla, Hindi, and Malayalam (Simpson, Choudhury, and Menon 2013, Takahashi 2013), and in other languages such as Colloquial Singapore English (Sato 2014, 2016), Mongolian (Takahashi 2007), Persian (Sato and Karimi 2016), Turkish (Şener and Takahashi 2010), and Hebrew (Landau 2018).

2 The verb-stranding VP-ellipsis analysis has also been proposed for Hebrew (Doron 1999, Goldberg 2005), Irish (McCloskey 1991), Persian (Shafiei 2015), and Russian (Gribanova 2013a,b).

3 The strict identity reading in (11b) would be expected to be available to all Korean speakers under either the ellipsis or the null pronominal analysis. Under the ellipsis analysis, ku in the null object site [e] would readily serve as a coreferential pronoun, which has been standardly assumed to be the source of strict identity readings under ellipsis. Under the null pronominal analysis, the strict identity reading would be generated if the postulated null pronoun is coreferential with the object in the antecedent clause.

4 A reviewer observes that the correlation between the acceptance rates in the null object–bound and quantificationalbound conditions could simply reflect response biases of individuals, rather than telling us anything about the grammar. To rule out this interpretation, as suggested by the same reviewer, we examined null object–bound and null object–referential acceptance rates, a pair of conditions where correlation is not theoretically expected. We found no correlation whatsoever between the two null object conditions (R2 = .0003, t = 0.11, p = .92). The same reviewer was concerned about the power of the correlation reported, and suggested that we use a bootstrap procedure to calculate a 95% confidence interval for the R2 value. Using the “boot” package (Canty and Ripley 2017), we generated the bootstrapped 95% confidence interval, [0.36, 0.78], for R2 in the linear regression of null object–bound and quantificational-bound on the basis of 1,000 replications. This confidence interval does not include 0, and the lower bound is far from 0, so our conclusion is supported that the correlation between the acceptance rates of the null object–bound and the quantificational-bound conditions is significant.

5 The mean acceptance rates in the quantificational-referential and null object–referential (strict identity reading) conditions are uniformly high, as predicted by both the ellipsis and null pronominal analyses (see section 2.1). These results thus confirm the accuracy and reliability of the results obtained in the quantificational-bound and null object–bound (sloppy identity reading) conditions, which are the key test conditions of the experiment.

6 The results obtained from the participants’ responses on the null object–“modifier mismatch” fillers further support the idea that some cases of Korean null objects should be analyzed as involving ellipsis, not pro. As noted by J.-S. Kim (2012:42–43), the ellipsis and null pronominal analyses yield different predictions regarding the truth value of the target sentence in (18). Under the argument ellipsis analysis or verb-stranding VP-ellipsis analysis, the null object site [e] in the second conjunct involves a full-fledged structure containing chakawun umlyoswu ‘cold beverage’, which is elided under identity with its antecedent in the first conjunct. Therefore, the whole target sentence should be judged false, since it is not compatible with the given context where Minswu drank a cold beverage, but Kiswu drank a warm beverage. According to the null pronominal analysis, on the other hand, the null object site [e] corresponds to the head noun of the full DP object in the first conjunct, umlyoswu ‘beverage’. Thus, the whole target sentence should be taken to truthfully describe the given context, since it is true that both Minswu and Kiswu drank a beverage, although the beverages consumed were of different temperatures. The results revealed that the participants rejected “modifier mismatch” target sentences 93% of the time, indicating that they interpreted the null object site as involving the same full DP objects as in the first conjuncts and thus supporting the ellipsis analysis.

7 As a reviewer observes, speakers might still be using the pro analysis in some cases. A few participants who consistently rejected the sloppy reading accepted the quantificational bound reading at least once, and a few participants who consistently rejected the quantificational bound reading accepted the sloppy reading at least once. These participants might be resorting to the pro strategy in analyzing some instances of null objects. Our main point, however, is that the correlational distribution of the two readings that we found supports the claim that the analysis of null objects tested in Experiment 1 involves ellipsis for the most part, and is incompatible with the view that all instances of null objects in Korean are instances of pro.

8 As Oku (1998:173) discusses, the verb-stranding VP-ellipsis analysis assumes that (“low”) adverbs are adjoined to VP (Ko 2007, Lasnik 2003). It is possible that the ellipsis site could be just an unmodified VP, something that Moulton (2007) shows is possible for VP ellipses in English. However, Moulton (2007) also shows that this possibility arises only in subordinated clauses, and that modified antecedents for ellipsis are chosen when the clause containing the ellipsis is a main clause, as in the cases we tested in Korean.

## Acknowledgments

We are extremely indebted to the three anonymous reviewers for their insightful comments that were crucial in improving this article. The research reported here was partially supported by SSHRC 435-2014-0161 and AKS-2016LAB-2250004 to Han.

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