Could /Can it have happened last night?

　　It couldn’t/can’t have happened last night.

　　(3)

　　He must be reading, isn’t he?

　　You must do it yourself, don’t you?

　　He must have gone over the article, hasn’t he?

　　It must have rained last night, didn’t it?

　　1. It’s nearly seven o’clock. Jack_____ be here at any moment.

　　A. must

　　B. need

　　C. should

　　D. can

　　2.-- When can I come for the photos? I need them tomorrow afternoon.

　　--They______ be ready by 12:00.

　　A. can

　　B. should

　　C. might

　　D. need

　　CB

　　九、“情态动词+动词完成式”所表示的意义

　　1）对过去情况推测。

　　must/may/might have done

　　can’t/couldn’t/may not/might not have

　　done

　　can/could have done…?

　　2）译成“本…”could/should/need have done.

　　You should have come here five minutes earlier.

　　3）虚拟语气（与过去事实相反的主句）

　　If you had followed my advice, you wouldn’t have been defeated。

　　1. I was really anxious about you. You____ home without a word.

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