3.Mentalistic Approach (思维分析方法) It is based on Chomsky's TG Grammar,and it insists that human being are endowed with a set of innate language acquisition devices(LAD--- 习得机制)which enable them to make hypotheses about the structure of the target language.These hypotheses develop with the age into the norm. Therefore,language acquisition is considered as a process in which learner's LAD plays an important role,and errors are no longer viewed as a faulty version of the target language.3.Mentalistic Approach （思维分析方法） • It is based on Chomsky’s TG Grammar, and it insists that human being are endowed with a set of innate language acquisition devices(LAD---语言 习得机制) which enable them to make hypotheses about the structure of the target language. These hypotheses develop with the age into the norm. •Therefore, language acquisition is considered as a process in which learner’s LAD plays an important role, and errors are no longer viewed as a faulty version of the target language