情态动词用法+have_done.ppt

1、Modal Verbs,Lets Learn,情态动词have done,can/could/may/might have done 都表示对过去所发生的事情的推测。意为“也许可能已经” 。 Shes two hours late. what can/could have happened?,(2) could/might have done 还表示过去本能够本可以做某事是而实际没有做，有时含有“责备”之意。 In my view, the accident could/might have been prevented. You could/might have told me about

2、it earlier. (3) could/might have done 还表示过去本会发生某事而幸好没有发生。,You were stupid to try climbing up there. You could/might have killed yourself. You shouldnt have run across the road without looking round. You might/could have been knocked down by a car. (4) could/might have done 还用于虚拟语气中。表示“过去本会做某事”而没有做。,

3、2. must have done 表示对过去所发生的事情的肯定推测,意为“肯定一定做了或发生了某事” 。 只用于肯定句中。 Someone must have opened the cage the lion couldnt have escaped on its own. I didnt hear the phone. I must have been asleep.,3. should/ought to have done 表示过去本应该做某事而实际上没有做，含有“责备”之意。 The plants dead. Maybe I should have given it more wate

4、r. I know I ought not to have taken the money. Compare:,(2) 表示对过去所发生的事情的推测,意为“应该会”，“理应会” 。 Its eight oclock. He should have arrived here (should be here) by now. (3) 有时表示对将来要发生的事情的推测。 I should have finished reading it by Friday.,4. neednt have done 表示过去本不需要做某事而实际上做了。 There was plenty of time. I need

5、nt have hurried. (But I hurried.),1. Sorry Im late. I _ have turned off the alarm clock and gone back to sleep again. A. might B. should C. can D. will 2. Peter _ come with us tonight, but he isnt very sure yet. A. must B. may C. can D. will 3. Some people who dont like to talk much are not necessar

6、ily shy, they just be quiet people. A. must B. may C. should D. would 4. Liza _ well not want to go on the trip - she hates traveling.（2008全国II） A. will B. can C. must D. may,A,B,B,D,5. Michael _ be a policeman, for hes much too short. A. neednt B. cant C. should D. may 6. - I stayed at a hotel while in New York. - Oh, did you? You _ with Barbara. A. could have stayed B. could stay C. would stay D. must have stayed 7 .My sister met him at the Grand Theater yesterday afternoon, so he _ your lecture. A. couldnt