Students in the language acquisition process often will be affected by the emotional factors influence and restriction. Affective filter strength because of the person Different, a negative attitude of the foreign language learners affective filter function is very strong, they are often reluctant to take the initiative to acquire more of the language input, even if understandable language input can't be guaranteed to eventually acquire these knowledge. A positive attitude to learning for language input plays a weaker filtering effect, a positive attitude toward learning often actively seek additional language input. Therefore, the input is the cause of language acquisition, and affective factors in language acquisition is the ultimate key
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