Grammars are of different kinds. A fully explicit grammar exhaustively
describing the grammatical constructions of a language is called a descriptive
grammar. It does not teach the rules of the language; it describes the rules that are
already known. In other words, a descriptive grammar of language does not tell
you how you should speak; it only describes your unconscious linguistic
knowledge. Such a grammar is a model of the mental grammar every speaker of
the language knows.
A grammar that attempts to legislate what your grammar should be is called
a prescriptive grammar. From ancient times until the present, “purists” have
believed that language change is corruption, and that there are certain “correct”
forms that all educated people should use in speaking and writing. So, if the
descriptive grammar only describes your unconscious linguistic knowledge, the
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