情态动词 (2).ppt

1、情态动词的特殊用法,can . can 和 could 可以表示某人或某物一时的特点，可以翻译为“有可能，有时会”。 It can be very warm in this area .这个地区有时 可能非常暖和. It can be crowded in the street now. (2). can表示能力时，可以与be able to 换用。但是在将来时和完成时中必须用be able to ；表示经过努力而成功地办到了某个具体的事情时，只能用be able to ，不可以用can。这种用法的be able to 相当于succeed in 或manage to。,Canyoutype

2、？ Areyouable to type ？ I am sure we shall be able to get you a job soon . He has been able to finish the work on tim. (3).can/could+have done表示对过去的行为的怀疑和不肯定，通常用在否定和疑问句中。 Can they have won the basketball match? 他们可能赢了篮球赛吗？ It couldnt have been Mr. Green. He has gone to New York.,After years of hard w

3、ork he was able to win the prize 。（不可以用could）,(4).cant / cannot too 后的附加疑问句的动词用肯定形式can，不用 cant。 You cant praise him too much ，can you ？你无论怎样赞扬他都不为过，对吧 ? You cannot be too careful when crossing the road.,must,1).must有一种含义：“偏要”“硬要”。表示说话人对句子主语所发出的动作或行为是不希望的、不满的甚至是生气的。通常指令人不愉快的事情。 2).must用于第二人称时，常常含有讽刺挖

4、苦的意思：,1.Why must you be so stubborn （表固执）？ 2.He must come and worry her with questions，just when she was busy cooking the dinner . 3.If you must smoke ，at least you could use an ashtray（烟灰缸）. 4.As I was sitting down to lunch ，the electric bell must ring . 5.Why must you be so late ？,must +have done

5、表示对过去已经发生的行为进行推测，意为“想必/准是/一定作了某事”。,1.It must have rained last night, for the road was very muddy. 昨晚 一定是下雨了， 因为地上很泥泞。 2.He must have gone to Beijing. 他一定已经去北京了。,must 在反意疑问句时，应注意: .must 作“必须”解时,反意疑问句中重复must 。 All the children must respect their parents ，mustnt they ？孩子必须尊敬父母，对吗？ must 作“有必要”解时，反意疑问句中用

6、need 。 We must tell her the truth ,neednt we ？我们现在有必要告诉她实情，对吗？,1).Judging from his accent, 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?,4).We must

7、have learned 2,000words by the end of last term,hadnt we?,6).He must have gone to Beijing,didnt it?,hasnt he?,5).It must have rained last night, for the road was very muddy，,练习题： 1.You mustnt tell it to your morther ，_？ Amust you Bdo you Cneed you Dwill you 2.-The students must hand in their term pa

8、pers in a week ，_？ -No，they _。 Aneednt they ，mustnt Bmustnt they ，mustnt Cmustnt they ，neednt Dshouldnt they ，should,C,D,shall 1.shall 用于第二、三人称陈述句中，表示说话人给对方的命令，警告，允诺或威胁。 1)You shall go with me.(命令) 2)You shall have the book when I finish it.(允诺) 3)He shall be punished.(威胁) 2. shall用于第一、三人称疑问句中，表示说话人

9、征求对方的意见和向对方请示。 4)Shall we begin our class?（征求意见） 5)When shall Mike be able to leave hospital?(请示),1. It has been announced that candidates_remain in their seats until all the papers have been collected. A.can B.will C.may D.shall 2. Havent I told you already that you_have my answer tomorrow morning

10、? A. will B.shall C.should D.would 3.Nobody_throw away rubbish everywhere ! A.can B.need C.shall D.must,D,C,B,should (1).should表示“居然，竟然”。 e.g.我不敢相信这样一个绅士居然对老人如此无礼。 I cant believe such a gentleman should be so rude to the old.,(2). should常表示劝告、建议、命令，与ought to意义相近，但ought to多表示责任、义务，语气强烈。在疑问句中通常用should

11、代替ought to。Young people should learn how to use computers.,(3).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. e.g. You should/ought to have told her the truth earlier. She shouldnt have left without saying a word.,will 人作主语表示意愿或固执坚持。用于非人主语时，表示固有性质，倾向. She wont lend me t

12、he money .她不愿把钱借给我。 The window wont open .窗子打不开。 The door wont shut .门关不上了。,(2).will可以用来表示某些根据自然规律必定会发生的事情，并且此时可以用一般现在时来代替它。 Oil will float on water .油能在水上漂流。 If the pure water is heated to 100 , it will boil(可以用boils). 如果纯净的水加热至100，它就会沸腾。 Matches will not strike if they are damp.火柴如果潮湿，就划不着。,1.Only

13、 in summer_ . A.will the ice melt B.the ice will melt C.the ice can melt D.the ice melts 2.If you_wait a moment ,Ill go to see if Mr.Johns is free . A.shall B.will C.would D.need,A,B,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 don

14、e 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,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 what we wanted. 3. We may have read the same report. 4. He cant have slep

15、t 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.,巩 固 练 习,1.-What _ it be? -It _ be a mail box, for it is moving. It _ be a car. A. can; cant; must B. can; can; must C. can;

16、mustnt; must D. must; mustnt can 2. -Isnt that Anns husband over there? -No. it _ be him-Im sure he doesnt wear glasses. A.cant B. must not C. wont D, may not 3.-When can I come for the photos? I need them tomorrow afternoon. -They _ be ready by 12:00. A. can B. should C. might D. need 4.-are you co

17、ming to Jeffs party? -Im not sure. I _ go to the concert instead. A. must B. would C. should D. might,A,A,B,D,5.-You may laugh, but Ive been thinking of becoming a vegetarian. -Oh, you _ be out of your mind. You will be hungry all the time. A. will B. may C. must D. should 6.-I wonder why they are l

18、ate? -They _ the train. cant have missed B. could miss C. must have missed D. might miss 7.-Show me your permit, please! -Oh, its not in my pocket. It _. A. might fall out B. could fall out C. should have fallen out D. must have fallen out,C,C,D,7. -Has Mike started? He said he would join in the par

19、ty. -He _. He is a man of keeping his word. A. could have left B. must have left C. cant come D. wont be coming 8.Everything has two sides. Beautiful songs, sometimes, _ be just noise to others. must B. may C. should D. could 9. -There were already five people in the car, but they managed to take me

20、 as well. -It _ a comfortable journey. A.cant be B. mustnt have been C. should be D. couldnt have been 10.Chinese must have the largest number of speakers, _. A.mustnt they B. havent they C. dont they D. didnt they,B,B,D,C,巩 固 练 习,1.Oh, Im not feeling well in the stomach. I _ so much fried chicken j

21、ust now. A. shouldnt eat B. shouldnt have eaten C. mustnt eat D. mustnt have eaten 2.-Why hasnt Jane arrived yet? -She _ again in the morning? A. shouldnt have overslept B. may have turned off the alarm clock C. must have no one t o call her D. should have someone to wake her up 3.-Did you go to the

22、 movie the day before yesterday? -No. We _, but we decided not to. A.should have gone B. could go C. should go D. could have gone,B,B,A,4.As it turned out to be a small house party, we _ so formally. neednt dress B. didnt have to dress up C. Might not have dressed up D. neednt have dressed up 5.Im r

23、ather surprised you havent reported him to your teacher. In my opinion, you _ this as soon as you found out he was cheating. must have done B. might have done C. should have done D. could have done,D,C,试题预览 1. _ fired, your health care and other benefits will not be immediately cut off. A. Would you

24、 be B. Should you be C. Could you be D. Might you be 解析：答案为 B。Should you be fired = If you should be fired。英语中should是一个常用的情态动词，但它可用于条件状语从句中，表示语气较强的假设，意为“万一，竟然”。,2. Whats the name?Khulaifi. _ I spell that for you? A. Shall B. Would C. Can D. Might 解析：答案为A。Shall I/we . . . ? 是用来表示征求对方意见或建议的常用句型，它不表示将来

25、。注意：shall的这一用法也适用于第三人称的疑问句中。,3. John, look at the time. _ you play the piano at such a late hour? A. Must B. Can C. May D. Need 解析：答案为A。此题考查must的特殊用法。这里must表示与说话人相反的愿望或语气不耐烦，意为“偏偏，偏要”。注意：近几年must表示“偏偏，偏要”这一用法已成为高考的一个热点。,4. Must I turn off the gas after cooking?Of course. You can never be _ careful wi

26、th that. A. enough B. too C. so D. very解析：答案为B。can/could not（never） . . . too是一个固定搭配，意为“无论也不过分，越越好”。,5. Some aspects of a pilots job_ be boring, and pilots often _ work at inconvenient hours. A . can；have to B. may；can C. have to；may D. ought to；must 解析：答案为A。考查can表示一时的可能性、偶尔发生的事情，意为“有时会”。这个考点在近几年高考中

27、备受青睐。第二空表示“不得不”。,8. Excuse me, but I want to use your computer to type a report.You _ have my computer if you dont take care of it. A . shant B. might notC. neednt D. shouldnt 解析：答案为A。在表达“许诺、警告、意图、命令、决心”等，且主语为第二、第三人称时，须用情态动词shall。,9. You cant imagine that a well-behaved gentleman _ be so rude to a l

28、ady. A. might B. need C. should D. would 解析：答案为C。should可用在表示惊奇、怀疑、不满等语气的名词性从句中，意为“竟然、竟会”。这一点也是近年高考的热点。,7. When he was there, he _ go to that coffee shop at the corner after work every day. A. would B. should C. had better D. might 解析：答案为A。would此处表示过去反复发生的动作或行为，意为“总是，习惯于”。,6. When can I come for the

29、photos? I need them tomorrow afternoon.They _ be ready by 12:00. A. can B. should C. might D. need解析：答案为B。should可用于肯定句中，表示说话人较为婉转的推测，并留有余地，具有“可能；该”之意。,10. Many people agree that _ knowledge of English is a must in _ international trade today. A. a；不填 B. the；an C. the；the D.不填；the 解析：答案为A。句中的must为名词，

30、意为“必需的物品、不可缺少的东西”。如果同学们对must作名词的用法掌握较好，则非常有助于对该题的理解与解答。,11. How _ you say that you really understand the whole story if you have covered only part of the article? A. can B. must C. need D. may 解析：答案为A。can可用在疑问句、否定句中，表示说话者对那人所说的“只看了文章的一部分，就知道整个故事”感到怀疑和惊讶。,12. The fire spread through the hotel quickly but everyone _ get out. A. had to B. wouldC. was able to D. could 解析：答案为C。was/were able to表示经过努力而成功地做成某事，相当于managed