情態(tài)動(dòng)詞用法+have_done

1、can could be able to may might must shall should will wouldought to dare need have to used to had better 情態(tài)動(dòng)詞情態(tài)動(dòng)詞have donecan/could/may/might have done(1) 都表示對過去所發(fā)生的事情的推都表示對過去所發(fā)生的事情的推測。意為測。意為“也許可能已經(jīng)也許可能已經(jīng)” 。 肯定句肯定句: may/might/could have done (can have done) 否定句否定句: cant/couldnt/may not/might not hav

2、e done 疑問句疑問句: Can/Could/Might have done? (Mayhave done?) Shes two hours latewhat can/could have happened? Can/Could he have missed her train? Yes, she may/might have. She may/might/could have overslept and got up too late. Might I have lost it somewhere? Compare: He cant/couldnt/may not/might not h

3、ave gone out because the lights on. (現(xiàn)在對過去的推測現(xiàn)在對過去的推測) I thought he couldnt/might not have gone out because the light was on. (過去對過去之前的推測過去對過去之前的推測) I thought it might rain. (It may rain.) I asked if it could rain. (Can it rain?) (過去對過去將來的推測過去對過去將來的推測) My wifes in hospital our baby could/may/might a

4、rrive at any time. (現(xiàn)在對將來的推測現(xiàn)在對將來的推測) What do you think that noise was? It may/might/could have been a cat. (現(xiàn)在對過去的推測現(xiàn)在對過去的推測) What do you think that noise is? It may/might/could be a cat. (can) (現(xiàn)在對現(xiàn)在的推測現(xiàn)在對現(xiàn)在的推測)(2) could/might have done 還表示過去本還表示過去本能夠本可以做某事是而實(shí)際沒有做，能夠本可以做某事是而實(shí)際沒有做，有時(shí)含有有時(shí)含有“責(zé)備責(zé)備”之意。

5、之意。 In my view, the accident could/might have been prevented. You could/might have told me about it earlier.(3) could/might have done 還表示過去本還表示過去本會發(fā)生某事而幸好沒有發(fā)生。會發(fā)生某事而幸好沒有發(fā)生。You were stupid to try climbing up there. You could/might have killed yourself. You shouldnt have run across the road without lo

6、oking round. You might/could have been knocked down by a car.(4) could/might have done 還用于虛擬語還用于虛擬語氣中氣中。表示。表示“過去本會做某事過去本會做某事”而沒有而沒有做做。 If he had not been busy then, he could/might (也可用也可用would) have helped me. =He could/might/would have helped me, but he was busy then. =He was busy then. Otherwise/O

7、r/Or else he could/might/would have helped me. He could/might/would have helped me, even if he was busy. I could/might/would not have finished it in time without your help. 2. must have done 表示對過去所發(fā)生的事情的肯定推測表示對過去所發(fā)生的事情的肯定推測,意為意為“肯定一定做了或發(fā)生了某肯定一定做了或發(fā)生了某事事” 。 只用于肯定句中。只用于肯定句中。 Someone must have opened t

8、he cage the lion couldnt have escaped on its own. I didnt hear the phone. I must have been asleep. Compare: Was that the manager who walked by? It must have been./No, it cant have been. Is that the postman who is knocking at the door? It must be./It cant be. 3. should/ought to have done 表示過去本應(yīng)該做某事而實(shí)

9、際上沒有表示過去本應(yīng)該做某事而實(shí)際上沒有做，含有做，含有“責(zé)備責(zé)備”之意。之意。 The plants dead. Maybe I should have given it more water. I know I ought not to have taken the money. Compare: Compare:We didnt exercise much, but we really ought to have/should have. We dont exercise much, but we really ought to/should.(2) 表示對過去所發(fā)生的事情的推測表示對過

10、去所發(fā)生的事情的推測,意意為為“應(yīng)該會應(yīng)該會”，“理應(yīng)會理應(yīng)會” 。 Its eight oclock. He should have arrived here (should be here) by now. That was disappointing we should have won that game easily. (3) 有時(shí)表示對將來要發(fā)生的事情的推測。有時(shí)表示對將來要發(fā)生的事情的推測。 I should have finished reading it by Friday. 4. neednt have done 表示表示過去過去本不需要做某事而實(shí)際上做本不需要做某事而實(shí)際

11、上做了。了。 There was plenty of time. I neednt have hurried. (But I hurried.) Compare: There was plenty of time, so I didnt need to hurry. (So I didnt hurry.) Compare:Theres plenty of time, so I neednt hurry. (now)1. Sorry Im late. I _ have turned off the alarm clock and gone back to sleep again. A. migh

12、t B. shouldC. can D. will2. Peter _ come with us tonight, but he isnt very sure yet. A. must B. may C. can D. will3. Some people who dont like to talk much are not necessarily shy, they just be quiet people. A. must B. may C. should D. would4. Liza _ well not want to go on the trip - she hates traveling.（2008全國全國II）A. will B. can C. must D. may ABBD5. Michael _ be a policeman, for hes much too short. A. neednt B. cant C. should D. may6. - 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 hav