[简答题]Review the tenets of Krashen’s Input Hypothesis.

参考答案: Krashen’s Input Hypothesis assumes that humans acquire language in only one way--by understanding messages, or by receiving "comprehensible input", which refers to utterance that the learner understands based on the context in which they are used as well as the language in which they are phrased. In language acquisition, we move from i, our current level, to i+A, the next level along the natural order, by understanding input containing i+A. The input hypothesis relates to acquisition, not to meaning. Comprehension is helped by the situation and the context, extralinguistic information and knowledge of the world.After the acquirer has built up linguistic competence by understanding input, the ability to speak fluently will emerge independently in time. It cannot be taught directly. Enough comprehension input provides i+A automatically.