Question

情态动词+have done是虚拟语气吗？

请详细解释一下。

Answer 1

这个不一定是的。它可以有两种情况的。
情态动词+have done:第一，表推测;第二，表虚拟。
1.edn't /shouldn't +have done 表对过去的推测，译为“本不需要、本不应该做....”
2.can't have done 表对现在的推测。译为“不可能....”
3.mustn't have done 表对过去的推测。译为“一定不会...”
4.couldn't have done 表推测是和2一样。它也可表虚拟，译为“本不可能...”
嘿嘿，我们老师今天上午刚讲的，应该没错。你也可以再咨询一下你们的老师。

Answer 2

是，翻译为本应该，本可能做某事，意为并没有做成某事

Answer 3

对过去的事实进行推测：结构：情态动词+have done / been+名词/形容词/介词短语
例句：
1. Mrs. Longmans must have been a pretty girl in her youth.
2. He couldn’t have seen Anna yesterday. She’s gone abroad.
3. I think I must have left my glasses in the library.
4. He might have overslept again.
5. Where can Tom have gone ?
情态动词表达虚拟语气：表达“本来…”，“不然早就…”。这是情态动词的一种虚拟语气用法。表示说话人所讲的与所发生的事实相反。表达了说话人的埋怨，后悔的语气。其结构是在一些情态动词后面加 have done 结构。根据要表达的意思，有如下结构：
should have done / ought to have done：本应该……
shouldn’t have done / oughtn’t to have done：本不该……
could have done：本来可以……
needn’t have done：本来没必要……
would like to have done：本来很想……
would rather not have done: 本来不愿意……
could / might / have done: 不然早就……
例句：
1. You shouldn’t have laughed at his mistakes.
2. You could have told us earlier.
3. I ought to have bought that dictionary last week.
4. You ought not to have spent so much time in reading novels.
5. We need not have been in a tearing hurry to catch the train.
6. They would like to have seen that film last film.
7. If he had given me his number, I could have telephoned him.
8. They might have been frozen to death but for the rescue in time.