表示对过去的推测can have done,may have done 有什么不同?有的书上说有can not have done 没有can have done迷糊了◑▂◐

题目

表示对过去的推测can have done,may have done 有什么不同?有的书上说有can not have done 没有can have done迷糊了◑▂◐

答案

书上说的是对的,只有can't have done 不可能做过某事,而没有can have done.但我们可以说could have done.
could have done = may have done 可能做过某事