Phrase Structure Grammar (PSG), also known as constituents or context-free grammar, is a type of formal grammar that describes the syntactic structure of sentences in a language by defining how phrases and sentences can be generated from smaller units or constituents. It focuses on the hierarchical organization of language, where sentences are built up from smaller phrases and words through a set of rules. In Phrase Structure Grammar, phrases can be thought of as structured groups of words that serve specific grammatical functions.
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