《高中情态动词大全（课堂PPT）》由会员分享，可在线阅读，更多相关《高中情态动词大全（课堂PPT）（32页珍藏版）》请在金锄头文库上搜索。
1、情态动词(一）,modal verbs,Grammar,情态动词,表示推测,不表示推测,can could may might shall should must will would ought to,have to dare (darent) need (neednt) used to,情态动词有一定的意义，但没有人称和数的变化，不能独立使用，它和后面的动词构成谓语 只作情态动词的can/could, may/might, ought to， must 可情态可实义的need, dare/dared 可情态可助动词的shall/should, will/would 相当于情态动词的have
2、 to, used to,must , can/could, may/might 的用法,must,1.must 表示推测时， 只能用于肯定句。,e.g.这个电脑肯定出了问题。,There must be something wrong with the computer.,你努力学了一整天， 一定累了吧,You have worked hard all day. You must be tired.,2.must +be doing/do 表示对现在的动作进行肯定推测,e.g.他现在一定在看小说.,He must be reading novels now.,他们买了一辆新车。 他们一定很有
3、钱.,They have bought a new car. They must have a lot of money.,3.must +have done 表示对过去发生的事情作出的肯定判断,e.g.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.,路是湿的。昨天晚上一定下雨了。,The road is wet. It must have rained last night.,对现在或将来情况推测：must +动词原形。 must只能用于肯定。否定和疑问分别用can
4、t和can。 e.g. He must tell a lie. Can he tell a lie ? He cant tell a lie. *must-should/ought to may-might/could+do 可能性依次减弱,He must be reading, isnt he? You must do it yourself, dont you? He must have gone over the article, hasnt he? It must have rained last night, didnt it?,表猜测语气的反意疑问句的构成,can/could,1.
5、 can /could 表示推测时，只能用在否定句或疑问句中。,e.g. Its so late. Can Tom be reading?,Can it be Mr. Green?,这个人不可能是玛丽， 她生病了。,It cant be Mary. She has fallen ill.,她不可能在说谎。,She couldnt be telling lies.,2. can/could have done 对过去发生行为的可能性进行推测:,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.,门是锁着的
6、， 所以她不可能在家。,The door was locked.,She couldnt have been at home.,3. can/could have done “本可以，本来可能已经”用于肯定句中，表示对过去发生的事情做出的判断.,e.g.你本来可以考的更好。,You could have had a better mark.,may/might,1.may/might表示推测时，只能用于陈述句，表示对现在或将来要发生的动作把握不大。,e.g.她们明天可能会到这里来。,They may come here tomorrow.,他们可能还在等我们呢。,They may be sti
7、ll waiting for us.,3.might/may have done,表示对过去发生的动作进行可能性推测。,e.g.他可能去医务室了。,He may have gone to the clinic.,他可能已经从报纸上知道这个消息了。,He might have read about the news in the newspaper.,14,用于表达合理推断。 e.g. It is three oclock, the football game should begin now. Mary took dancing lessons for years, she should be
8、 an excellent dancer.,2. should 的用法,表示推测情态动词的重要用法.,肯定的推测 可能的推测 否定的推测 疑问的推测,must,对将来 对现在 对过去,情态动词,may, might,cant, couldnt,can, could,+ V. + V. + have done 常见must be + be doing,+ V. + V. + have done + be doing 可以用not表示“可能不”,+V. + V. + have done + be doing,+ V. + V. + have done + be doing,16,1.Judging
9、 from his accident, he must be from the south,2.Tom bought a lot of apples. He must like eating apples,3.It is eleven oclock at night and the lights are off. They must be sleeping now,isnt, he?,didnt he?,arent they?,因must后是实意动词like,因must后是系动词 be,must后接的是be sleeping，是对正在进行的情况推测,17,1.We must have lear
10、ned 2,000 words by the end of last term,hadnt we?,3.He must have gone to Beijing,didnt it?,hasnt he?,若句中含有过去完成时的时间状语，用过去完成时完成反意疑问句,若句中含有过去的时间状语，用一般过去时完成反意疑问句,若句中不含任何时间状语， 用现在完成时完成反意疑问句,2.It must have rained last night, for the road was very muddy，,1. I dont know where she is, she _ be in Wuhan. 2. A
11、t this moment, our teacher _ our exam papers. 这时，我们老师想必在批改试卷。 3. The road is wet. It _ last night. (rain) 4. Your mother _ for you. 你妈妈一定一直在找你。,may,must be marking,must have rained,must have been looking,5. Philip _ seriously in the car accident. 菲利普可能在车祸中受了重伤. 6. -Linda has gone to work, but her bi
12、cycle is still here. -She _ (go) by bus. 7. Mike _ his car, for he came to work by bus this morning. 迈克一定还没有找回他的车，因为早上他是坐 公共汽车来上班的。,may (might) have been hurt,may (might) have gone,cant have found,Practice 2:表示推测情态动词的重要用法.,1. You must be Mr Smith-I was told to expect you here. 2. He must have known
13、what we wanted. 3. We may have read the same report. 4. He cant have slept through all that noise. 5. Theres someone outside-who can it be? 6. What can they be doing? 7. These pills might help to cure your disease. 8. You could be right, I suppose.,1.-Is John coming by train? -He should, but he _ no
14、t. He likes driving his car. (2002高考题） A. must B. can C. need D. may 2.It has been announced that candidates(候选人) _ remain in their seats until all the papers have been collected. (2002上海高考题） A. can B.will C. may D. shall 3.-I heard they went skiing in the mountains last winter. (2002北京高考题） -It _ tr
15、ue because there was little snow there. A. may not be B. wont be C. couldnt be D. mustnt be,情态动词（二）,modal verb,Grammar ( 33ms ),23,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。,24,should/ought to+have done用于肯定句时，表示“本该做某事而实际上没做”，用于否定句时，则表示“不该做的事反而做了”。,1.You should have told him a week ago. 你本来应该在一周前告诉他的。 2.You ought not to have taken the
