mustnt have done与cant have done区别

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mustnt have done与cant have done区别
mustnt have done与cant have done区别

mustnt have done与cant have done区别
一、cant have done 是 must have done 对过去推断的否定形式.
二、具体说明如下：
情态动词 must （必定、一定）”表示推断或指具有较大的可能性时,其否定式是 can't/cannot (不一定、不可能).
1.对现在的推断
* 肯定 —— must + be,如：
You must be very tired.你一定很累了.
* 否定 —— can't + be,如：
You can't be very tired.你不一定很累.
2.对过去的推断
* 肯定 —— must + have done,如：
He must have earned a large sum of money.他一定是挣了一笔巨款.
* 否定 —— can't + be,如：
He can't have earned a large sum of money.他不可能挣到一笔巨款.
三、关于 mustn't
mustn't 地意思是“不准许、]禁止”,mustn't have done 意思是“绝对不允许已经做过、绝对禁止做过”,不表示推断.因此与 can't have done 没有直接关系.

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