“情态动词+动词完成式”
1. must/ may / might + have done，对已发生行为的推测。
2.“ should + have done” “ ought to + have done”表示本来该做某事却未做，否定式“shouldn’t + have done” “ oughtn’t to + have done”本来不该做而做了的事。
3.“ needn’t + have done”做了本来不必做的事，“本来不必”。
2) He looks happy. He _________ (not know) this bad news.
3) Where is my pen ? I _______________ (lose) it.
4) He was late for work. He____________ ( not catch) the first bus.
5) I didn’t see her in the meeting room. She_____________(not speak) at the meeting.
6) She is two hours late. What__________________(happen) to her?
7) The plant is dead . I ____________(water) it from time to time.
8) Tom_____________ (not give away) the secret, but he meant no harm .
9) It was a five-minute walk from our school. You _________ (not come) by taxi.
(Keys: 2.can’t have known 3.may\might have lost 4. might not have caught
5. can’t /couldn’t have spoken 6. could\can have happened 7.should have watered 8. shouln’t have given away 9.needn’t have come)
▲ 注意: could/might+have done:表示过去有可能发生，但实际没有发生.
1) You were crazy to climb up that tree. You could have killed yourself.
2) You might have made more progress, but you didn’t work hard.
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