The Verb Phrase (VP) As A Source of Controversy
Most if not all theories of syntax acknowledge verb phrases (VPs), but they can diverge greatly in the types of verb phrases that they posit. Phrase structure grammars acknowledge both finite verb phrases and non-finite verb phrases as constituents. Dependency grammars, in contrast, acknowledge just non-finite verb phrases as constituents. The distinction is illustrated with the following examples:
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- The Republicans may nominate Newt.
- The Republicans may nominate Newt.
The syntax trees of this sentence are next:
The constituency tree on the left shows the finite verb string may nominate Newt as a phrase (= constituent); it corresponds to VP1. In contrast, this same string is not shown as a phrase in the dependency tree on the right. Observe that both trees, however, take the non-finite VP string nominate Newt to be a phrase, since in both trees nominate Newt corresponds to a complete subtree.
Since there is disagreement concerning the status of finite VPs (whether they are constituents or not), empirical considerations are needed. Grammarians can (again) employ constituency tests to shed light on the controversy. Constituency tests are diagnostics for identifying the constituents of sentences and they are thus essential for identifying phrases. The results of most constituency tests do not support the existence of a finite VP constituent.
Read more about this topic: Phrase
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