must have done 和must have been 的区别

都是对过去的猜测，二者的区别是什么？拜托说详细点~

推荐答案 2009-04-09

must 表示必须. 一定. must have done.表示对过去发生的事非常肯定的猜测.

而must have been 是对某物已经处于某状态或已经到达某地点的肯定猜测.

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第1个回答 2009-04-11

其实就是be动词与do动词的区别，该用哪个与must无关；你可以考虑现在完成时、一般现在时、一般过去时该用哪个，照此办理
It must have rained last night.昨晚肯定下过雨。
You must have been tired after all this work.本回答被提问者采纳

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