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7. He may be arriving this evening. 8. He may be traveling around the world. 9. The keys can’t 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 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. (责任编辑：admin) |