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其他用法
1. 情态动词后跟完成时,表示“应当已经……”,“想必已经……”,“本来可以……”等意。如:
He should have finished his homework before Monday. 他本应该在周一之前完成他的作业。
He was still at the airport. He must have missed the flight. 他还在机场,一定是没赶上飞机。
Where can (could) he have gone? 他能到哪里去了呢?
You may (might) have read about news. 你可能在报上已经读到这个新闻了。
He needn’t have worried about the matter. 他本不必为此事担心。
You ought to have come to the party, but why didn’t you? 你本应该来参加聚会,为何不来呢?
2. 情态动词后跟进行时,表示“想必正在……”,“可能正在……”,“应当正在……”等意。如:
They must be having dinner. 他们一定正在吃晚饭。
They may be discussing the project. 他们可能正在讨论这个项目。
He can’t be lying. 他不可能在说谎。
She shouldn’t be working like that. She was ill. 她不应当那样干,她生病了。
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