According to behaviorism, language learning is simply a matter of [填空1] and [填空2]
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There is the logical problem of language acquisition:children come to know [填空1] about the structure of their language than they could reasonably be expected to learn from the language [填空2]they hear.
Innateness Hypothesis was proposed by [填空1].
According to Innateness Hypothesis, children are born with a[填空1] to acquire a language. The human brain is biologically programmed. Children are born with innate knowledge about language, called[填空2], consisting of [填空3]and [填空4]. The former are applicable to all human languages while the latter are[填空5] in different languages.
TG grammar is a system of rules that in some [填空1]and[填空2]way assign structural descriptions to sentences.