must not 和need not这个短语有什么区别?下面让我们详细看一下：
must not表示禁止，是说话人强有力的劝告或命令，意为“一定要，不准。因此，在回答由must引导的问题时，如果是否定的回答，表示“不必，没有必要，不能用mustn’t，而要用needn’t或don’t have to.试比较：
You must not drive fast.你不能开快车。(路险或有速度限制)
You needn’t drive fast.(时间充裕)
You must not tell others.(警告)
You needn’t tell others.(没有必要)
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