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Three levels of adequacy
Observationally adequacy
A grammar reaches observationally adequacy if it forms rules and principles to distinguish those strings of words which are sentences of the language from those which are not sentences of the language in question.
Descriptive adequacy
A descriptive adequate grammar will not only describe the linguistic data, but it will contain the general principles and processes that enable the native speaker to produce and interpret sentences in his language and decide on the acceptability of sentences. Such a grammar is an explicit formulation of the tacit language of the native speaker, his internal grammar.
Explanatory Adequacy
A grammar reaches explanatory adequacy if it can account for the fact that the principles of the internal grammar can get to be known by the speakers, i.e. if it can account for language acquisition.Archiver|手机版|科学网 ( 京ICP备07017567号-12 )
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