Culicover and Jackendoff (2005) argue that VP structure with adjunct modifiers is “flat”: both complements and adjuncts are equally sisters of V. Their arguments center around the apparent misbehavior of do so as a replacement for a syntactic VP constituent. However, several of these arguments are inconclusive. The rule that Culicover and Jackendoff offer for do so does not fare better overall than does the hierarchic VP account of do so.

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