人教版必修三unit2 语法情态动词2.ppt

1、Grammar,_ _,1. Ought to,表应该做的事：You ought to do it carefully. 表非常可能的事：He ought to be here by now. ought to 表应该，语气should,2. ought to 的否定句形式是oughtnt to , 一般疑问形式是将ought 置于主语前. eg: We ought not to start so late. 3.在反意疑问句中常常省略to,用oughtnt 或是shouldnt.,You ought to have helped him with his English, _ ? wont

2、you B. ought not you C. shouldnt you D. wouldnt you,2. have to,have to 表示客观需要去做的事情，意为“必须，不得不。” I have to get the station early to catch the first train. We missed the bus so we had to walk home. We have to overcome all kinds of difficulties.,Have to 有多种时态。常见的有： 一般将来时 We will have to gather at the sc

3、hool gate at 7 tomorrow. 一般现在时 I have to take more money with me because my girlfriend has so much to buy. 一般过去时 Finally, we had to give up our idea to hold a picnic outside as it rained for a whole afternoon.,have to （考点）,must表主观意志，而have to表由于客观因素不得不做完成的事情。 Must没有过去式，除在间接引语中可表示过去的时间。在直接引语中表示过去的时间用h

4、ad to代替。 I told her that she must give up smoking. She said, “We had to get everything ready that night.”,比较must cant B. mustnt ; may C. shouldnt ; must D. cant ; shouldnt,B,2. -May I pick a flower in the garden? - _. A. No, you neednt B. Not, please. C. No, you mustnt D. No, you wont,C,Need I do ?

5、Yes, you must. No, you neednt.,3. dare & need,注意对need问句的回答: -Need I finish the work today? -Yes, _. No, _. No, _.,you must,you neednt,you dont have to,neednt 对其它情态动词的回答: -Shall I tell John about it? -No, you _. -No, you _.,-Must we do it now? -No, you _. -No, you _.,neednt,dont have to,neednt,dont h

6、ave to,1.You _ return the book now. You can keep it till next week if you like. cant B. mustnt C. neednt D. may not,C,2. Must I drive to his house and pick up the children? No, . A. you shouldntB. you might not C. you neednt D. you mustnt,C,情态动词+have done 的用法,1.Must +have done 表示对过去发生的事情 作出的肯定判断,1).

7、他们在玩篮球， 他们一定完成了作业。,They are playing basketball, they must have finished their homework.,2.路是湿的。昨天晚上一定下雨了。,The road is wet. It must have rained last night.,2.can/could have done 在否定句对过去 发生行为的可能性进行推测.,1.刚才我还看见他了， 所以他不可能出国的。,I saw him just now so he couldnt have gone abroad.,2. 门是锁着的， 所以她不可能在家。,The doo

8、r was locked.,She couldnt have been at home.,could(不用can)+have done,在肯定句中表示“本来能够而没能”，具有婉转的批评和责备之意,1. I could have passed my exam easily, but I made too many stupid mistakes. 我本来能够轻易通过考试，但我犯了太多不该 犯的错误。 2.You could have reported to me earlier. 你本该早点告诉我的。,3.might/may+have done,May/might have done sth表示

9、对过去的可能性推测“过去可能做了某事”其程度小于must have done sth。不用于疑问句。,She might have been hit by a car or motocycle. 她可能是被一辆小气车或摩托车撞了。 The Jinsha Ruins may have been the political and cultural centre of the ancient Shu Kingdom. 金沙遗址可能是古代蜀国的政治和文化中心。,3.might+have done表示“本来可能”，但实际上没有发生的事。另外，还可表示“本来应该或可以做某事”之意，含有轻微的责备语气。,

10、1.You might not have told her. 你本可以不告诉他的。（事实上你告诉他了） 2. You might have come earlier. 你本可以早点来的。（但没有这样）,4.should/ought to have done表示责备或批评,意为“本应该做到但没有做到”,用于否定则表示“本不该但”ought to的语气更强烈.,You should/ought to have told her the truth earlier. She shouldnt have left without saying a word.,neednt +have done表示做了

11、本来不必去做的事。,1.She neednt have gone to the station yesterday. 昨天她本不必到火车站去的.（昨天她去了） 2.You neednt have bought it. 你本可不必买它的。 （你买了）,Individual activity,1. We didnt see Tom at the meeting yesterday. He it. A. mustnt have attended B. cannot have attended C. neednt have attended D. would have not attended,B,2

12、.-There were already five people in the car, but they managed to take me as well. -It _a comfortable journey A. cant be B. shouldnt be C. mustnt have been D. couldnt have been,D,3Where is my pen? I _it. A. might lose B. would have lost C. should have lost D. must have lost 4. I didnt hear the phone.

13、 I _asleep A. must be B. must have been C. should be D. should have been,D,B,5. - Guess what! I have got A for my term paper. - Great! You _ read widely and put a lot of work into it. must B. should C. must have D. should have 6. The teacher _have thought Johnson was worth it or she wouldnt have was

14、ted time on him, I suppose. A. should B. can C. would D. must,C,D,7.She _ have left school, for her bike is still here。 A. cant B. wouldnt C. shouldnt D. neednt,A,8.Thank you for all your hard work last week. I dont think we _ it without you。 A. can manage B. could have managed C. could manage D. ca

15、n have managed,B,9.What a pity. Considering his ability and experience, he _ better。 A. need have done B. must have done C. can have done D. might have done,D,10. I cant find my purse anywhere。 - You _ have lost it while shopping。 A. mayB. canC. shouldD. would,A,11.- My cats really fat. - You _ have given her so much food. 2007 浙江卷 A. wouldnt B. couldnt C. s