精选优质文档-倾情为你奉上情态动词与虚拟语气常考考点一 情态动词+have done情态动词+have done 表示对过去的虚拟情态动词+have done用法例句must have done想必，准是，一定已经做了否定式为 cant/couldnt have doneIt must have rained last night, for the road is quite muddy.can/could have done本来能够做可能做了He could have finished the work in time.Can/Could he have gone to his aunts ? Cannot/could not have done不可能已经做了He cannot have forgotten it.He couldnt have forgotten it.may/might have done可能已经做了Its too late. I think
