Table 3 

Syntactic patterns used to detect answer type words. Square brackets represent optional elements.

PatternExample
(SBARQ (WHNP (WHNP (WDT) (NN)) [(PP)]… What kind of energy … 
(SBARQ (WHNP (WP)) (SQ (VBZ is) (NP)… What is one method that … 
(S (NP (NP (DT A) (NN)) (SBAR (WHNP (WDT that)) … A tool that .. 
(S (NP (NP) (PP)) (VP (VBZ is) … The main function of … is to … 
PatternExample
(SBARQ (WHNP (WHNP (WDT) (NN)) [(PP)]… What kind of energy … 
(SBARQ (WHNP (WP)) (SQ (VBZ is) (NP)… What is one method that … 
(S (NP (NP (DT A) (NN)) (SBAR (WHNP (WDT that)) … A tool that .. 
(S (NP (NP) (PP)) (VP (VBZ is) … The main function of … is to … 
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