1.mustn't在英语中不能用于表示推测,但是可以表示“禁止/不允许”之意.
如：You mustn't smoke here.在这里你不许抽烟.
2.can't/couldn't表示推测时,意思是“不可能...”,语气非常坚决的否定推测.
根据动作发生的时间,一般分为以下三种情况：
1）进行式（对正在发生的事情的否定推测）：can't be doing sth
can,t mustn,t用法区别词
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