Because Chomsky believes that language ability is innate, a skill of the brain, acquired through species, language skills that normal people possess. If you do not assume that people are born with language ability, can not reveal why people can master the language and other animals can not, can not explain why children's innate intelligence level and the learning environment after tomorrow are different, but all in four or five years of age in a sudden way to learn language. But the acquisition of language is inseparable from the input of language materials, children need to be exposed to a certain amount of raw language input in order to acquire the language. The idea of the ability to speak can also explain the human discovery of children raised by wild animals, because there is no language input is found will not use human language, into human society are different degrees of learning some language appearance.
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