should have done / ought to have done:本应该
shouldnt have done / oughtnt to have done:本不该
could have done:本来可以
neednt 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 shouldnt 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.
知识难点:
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