Phrase structure rules are a type of rewrite rule used to describe a given language's syntax and are closely associated with the early stages of transformational grammar, proposed by Noam Chomsky in 1
A noun phrase – or NP or nominal – is a phrase that usually has a noun or pronoun as its head, and has the same grammatical functions as a noun. Noun phrases are very common cross-linguistically, and
Phrase structure rules
…A is separated into the two subconstituents B and C . Some examples for English are as follows: The first rule reads: A S (sentence) consists of a NP (noun phrase) followed by a VP (verb phrase). The second rule reads: A noun phrase consists of an optional Det (determiner) followed by a N (noun). The third rule…
Those five beautiful shiny Arkansas Black apples is a noun phrase of which apples is the head. To test, a single pronoun can replace the whole noun phrase, as in "They look delicious".