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Sufficiency, transformational generative grammar believes that a complete grammar theory should achieve three sufficiency in the study of language structure:observationThe sufficiency of, that is, grammar should correctly reflect all language data within the observation;describeThat is, grammar should correctly describe the language intuition of native speakers, summarize the observed materials and reflect the internal laws;explainThat is, grammar should be based on the appropriate language theory, and choose a grammar that can fully describe each language.If a grammar can only explain a specific group of sentences, then this grammar is weak enough;If a grammar can not only explain a group of sentences, but also give each sentence a correct structural description, then this grammar is strong enough, and such a grammar theory can explain the speaker's language intuition and language ability.[1]
