2. They must be in bed already at this time of the night.
3. The teacher must be joking.
4. Freda isnt in class. She must be sick.
5. There must be something wrong.
6. She might be very clever, but she hasnt got much common sense.
7. He may be arriving this evening.
8. He may be traveling around the world.
9. The keys cant be in the room. I have just searched it very carefully.
10. Can the news be true ?
(三)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 couldnt have seen Anna yesterday. Shes 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:
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