Phrase structure rules Guide, Meaning , Facts, Information and Description
Phrase-structure rules were used in early
transformational grammar (TGG) to describe a given language's
syntax. This was accomplished by attempting to break
language down into its
constituent parts (also known as
syntactic categories) namely
phrasal categories and
lexical categories (aka
parts of speech). Phrasal categories include the
noun phrase,
verb phrase, and
prepositional phrase; lexical categories include
noun,
verb,
adjective,
adverb, and many others. Phrase structure rules were not an invention of TGG; rather, early TGG's defining characteristics were those systems which it had in addition to phrase structure rules (the most obvious example being
transformations;see the page
transformational grammar for an overview of the development of TGG.) A grammar which uses phrase structure rules is called a
phrase structure grammar.
Definition
Phrase structure rules are usually of the form , meaning that the constituent is separated into the two subconstituents and . Some examples are:
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