must have done 和must have been 的区别
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?
都是对过去的猜测,二者的区别是什么?
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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.
It must have rained last night.昨晚肯定下过雨.
You must have been tired after all this work.
1年前
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