Unit 2 Section Four Grammar and usage 2 课件.ppt

1、Unit 2 Section Four Grammar and usage 2 课件,情态动词 modal verbs,How many modal verbs do you know?,can could may might shall should must will would ought to,have to dare (darent) need (neednt) used to,表示推测,不表示推测,modal verbs,1.To talk about ability 2. To talk about obligation 3. To talk about uncertainty

2、4. To talk about permission 5. To make requests 6. To make suggestions 7. To make offers 8. To give advice,不表示推测时,注意以下用法：,can, could, be able to *be able to 能用于各种时态。 can / could 只能表示现在或过去的能力。 *was / were able to : “设法做成某事” 相当于 managed to do sth. succeeded in doing sth. All the people trapped in the

3、burning house were able to get out of it.,1.To talk about ability,2. To talk about obligation,ought to/should have to must *have to 能用于各种时态,且有人称和数的变化. ought to 的否定式为ought not to/oughtnt to,强,3. To talk about uncertainty,might may should ought to will must,强,may / might, can / could * might, could 比较

4、委婉, 一般多用于疑问句. * can, may 表达的语言比较随便. * 在以could, might 表示征询对方意见 或表示请求时，回答应相应使用can, may.,4. To talk about permission,will can could would,5. To make requests,6. To make suggestions,Shall we dosome exercise this morning?,7. To make offers 8. To give advice,Shall I get a ticket for you?,You should not/ou

5、ght not to eat a lot before swimming.,1. A computer _ think for itself; it must be told what to do. A. cant B. couldnt C. may not D. might not,2. The fire spread through the hotel very quickly but everyone _ get out. A. had to B. would C. could D. was able to,A,D,3. They will _ run this machine on t

6、heir own in three months. A. can B. could C. may D. be able to 4. That big cinema _ seat 2,000 people. A. can B. should C. ought to D. is able to,D,A,5. Could I borrow your dictionary? Yes, of course you _. A. might B. will C. can D. should 6. Might I watch TV after supper? Yes, you _. A. may B. mus

7、t C. might D. can,C,A,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 slept through all that noise. 5. Theres someone outside-who can it be? 6. What can they be doing? 7. These pills migh

8、t help to cure your disease. 8. You could be right, I suppose.,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 could,cant, couldnt,can, could,+ V. + V. + have done 常见must be + be doing,+ V. + V. + have done + be doing,+V. + V. + have done + be doing,+ V. + V. + have done + be

9、 doing,1. I dont know where she is, she _ be in Wuhan. 2. At 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. 昨晚一定下雨了. 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 ac

10、cident. 菲利普可能在车祸中受了重伤. 6. -Linda has gone to work, but her bicycle 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,高考考题: 1. I thought you _like something to

11、read, so I have brought you some books. A. may B. might C. would D. must 2. Where is my pen? I _it. A. might lose B. would have lost C. should have lost D. must have lost 3. I didnt hear the phone. I _asleep A. must be B. must have been C. should be D. should have been,B,D,B,4. -There were already f

12、ive 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 5. Its nearly seven oclock . Jack _be here at any moment. A. must B. need C. should D. could,D,D,不同的“肯定”程度可按下列层次排列： He is at home. (事实) He must be

13、 at home.（非常肯定的推断） He could be at home.（很可能） He ought to be at home.（很可能） He may be at home.（仅仅可能而已） He might be at home.（或许, 非常不确定） He might not be at home.（也许不在家） He may not be at home. （比might可能） He couldnt be at home.（很可能不在家） He cant be at home.（一定不在家） He isnt at home.（事实）,Notice !,1.情态动词：shall,

14、 will 的多种意义:,shall / will+ 动词原形:,* shall 可表示必须、命令、 警告或征询意见.,* will 可表示意愿、常出现的动作、在疑问句 中表示请求和建议.,* 均可表示将来。 过去时为 should, would.,1. He _ be punished if he disobeys. 如果他不服从, 就要受到惩罚. 2. We are not going to quarrel at all if you _ only let me speak. 只要你让我说话, 我们根本就不会吵架. 3. -Sir, _ he go or stay? -Let him go

15、. A. will B. shall C. might D. could,shall,will,B,4. The door _ open. 这门经常打不开. 5. Ronald _ stay in his small garden for a long time every day in the past. A. could B. might C. should D. would 6. You _ have the book after I read it. 我看完以后一定把这本书给你.,wont,D,shall,2. 表示否定的情态动词的用法: 部分情态动词的否定式是情态动词中的考点 之一。

16、,mustnt 不准, 禁止 neednt 没必要 ( = dont have to ) cant 不能; 不可能 may not 不可以; 可能不 shouldnt 不应该 ( = ought not to ),1. You _ return the book now. You can keep it till next week if you like. A. cant B. mustnt C. neednt D. may not 2. Johnny, you _ play with the knife, you _ hurt yourself. A. wont ; cant B. mus

17、tnt ; may C. shouldnt ; must D. cant ; shouldnt,C,B,3. -Will you stay for lunch? -Sorry, _. My brother is coming to see me. A. I mustnt B. I cant C. I neednt D. I wont 4. -May I pick a flower in the garden? - _. A. No, you neednt B. Not, please. C. No, you mustnt D. No, you wont,B,C,3.可兼做行为动词的情态动词：n

18、eed 、 dare,情态动词 (+动词原形),行为动词,.,need,dare,1.无人称和数的变化;,2.尤其用于：,*否定句及疑问句中;,*在if/whether之后;,*或与hardly, never, no one, nobody连用;,3.常以neednt 和darent 的形式出现;,4.dare有其过去时dared.,多用于肯定句; need to do dare to do need to be done need doing,判断正误:,How dare you say such a thing? How dare you to say such a thing?,He d

19、arent to speak English before such a crowd, did he? He darent speak English before such a crowd, dare he?,Nobody need to be afraid of catching the disease. Nobody need be afraid of catching the disease.,These dishes needed be cleaned carefully. These dishes need to be cleaned carefully. These dishes

20、 need cleaning carefully.,Practice:,1.Read the article on P29 and then complete it,Answers must (2) has to (3) must (4) must (5) should (6) ought to (7) could (8) may (9) could,2. Read Part A on page 31, and then complete the passage.,Answers (1) can (2) dare (3) can/could (4) may/might/could (5) mu

21、stnt/shouldnt/cant (6) mustnt/shouldnt/cant (7) can (8)neednt,3. Read Part B on page 31, and then complete the passage.,Answers Shall (2) shall (3) will (4) will/shall (5) will (6) will/shall (7) shall/will,plenty of, a lot of, lots of,language points,1.many, many a, a great/good many, a large/great number of/numbers of+Cn.,2.much, a great deal of, a large amount of, large amounts of +Un.,3.plenty of, a lot of, lots of, a large quantity of, large quantities of +Cn/Un.,language points,1