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Phrase Structure Rule Sign Video

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Definition

A recipe for syntactically combining expressions of certain syntactic categories. Along with the lexicon, phrase structure rules are a part of a descriptive grammar of some language. Phrase structure rules have the general form X -> Y_1 ... Y_n where X is a syntactic category and Y_1 ... Y_n correspond to the immediate syntactic constituents of the expression whose category is X.

Source: Language Files, eleventh edition, edited by Vedrana Mihalicek and Christin Wilson