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In the prepositional phrase apart from Jill, for example, the preposition apart requires that the complement include the preposition from. In the prepositional phrase since before the war, however, the preposition since does not require the preposition before and could have instead been something else, such as since after the war. [14]: 635–643
A grammar that uses phrase structure rules is a type of phrase structure grammar. Phrase structure rules as they are commonly employed operate according to the constituency relation, and a grammar that employs phrase structure rules is therefore a constituency grammar ; as such, it stands in contrast to dependency grammars , which are based on ...
Prepositional phrases are also placed beneath the word they modify; the preposition goes on a slanted line and the slanted line leads to a horizontal line on which the object of the preposition is placed. These basic diagramming conventions are augmented for other types of sentence structures, e.g. for coordination and subordinate clauses.
For example, a verb phrase consists of a verb together with any objects and other dependents; a prepositional phrase consists of a preposition and its complement (and is therefore usually a type of adverbial phrase); and a determiner phrase is a type of noun phrase containing a determiner.
Adjective phrase (AP), adverb phrase (AdvP), adposition phrase (PP), noun phrase (NP), verb phrase (VP), etc. In terms of phrase structure rules , phrasal categories can occur to the left of the arrow while lexical categories cannot, e.g. NP → D N. Traditionally, a phrasal category should consist of two or more words, although conventions ...
The term phrase structure grammar was originally introduced by Noam Chomsky as the term for grammar studied previously by Emil Post and Axel Thue (Post canonical systems). Some authors, however, reserve the term for more restricted grammars in the Chomsky hierarchy : context-sensitive grammars or context-free grammars .
— Verb-plus-prepositional-object predicate. She is in the park. — Verb-plus-predicative-prepositional-phrase predicate. She met him in the park. — Verb-plus-direct-object-plus-adjunct predicate. The predicate provides information about the subject, such as what the subject is, what the subject is doing, or what the subject is like.
Phrases can consist of a single word or a complete sentence. In theoretical linguistics, phrases are often analyzed as units of syntactic structure such as a constituent. There is a difference between the common use of the term phrase and its technical use in linguistics.