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1、Correct the mistakes and say why.,John shoulds go to school on time.At that time we thought we musted hand in our paper. You must to finish your homework in time. We dont can be there tomorrow.They should may do that.,should,must,cant,should / may,情态动词,有的情态助动词有现在时和过去时两种形式。 有的有现在时而无过去时。 有的有过去时而无现在时。,
2、情态动词的语法特征,1.情态动词除ought和have外，后面只能接不带to的不定式。 2.情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。 3.情态动词没有非谓语形式，即没有不定式，分词等形式。 4.时态，有的有现在时和过去时，有的有现在时，有的只有过去时。,Two eyes can see more than one. I am so strong that I can lift this stone. He said that Jack couldnt finish his work in such a short time. Could you follow my step
3、? He is only four, but he is able to read. She was able to do it without my help. Will you be able to come to my party tomorrow?,表能力,can could be able to,有时态变化,You can go now. I wont let you down. Could I say it in Chinese? May I know your name? Would you mind closing the door? Shall we dance? Might
4、 I have a word with you?,语气,强 弱,表许可,允许，征询意见,can, will could / may / would / shall / might,You should do what your parents tell you. If you cant finish the book by then, you must come and renew it. This is an important test, so we have to go over our lessons. The bridge was not wide enough so that so
5、mebody had to give up.,Should (道义,责任) must (主观 ) have to (客观),表义务(应该，必须),有时态变化,mustnt, shouldnt had better not,We mustnt waste our time. They shouldnt leave so soon. Youd better not disturb him.,表禁止,There must be a mistake. You may walk ten miles without seeing a house. He might get there on time. I
6、t can be true. In those days few workers could support their families.,表可能性(猜测，推测),must may, might, can, could,肯定句,语气,强 弱,语气,强 弱,She cant be serious. We couldnt have done better. People may not pick flowers in this garden. She was afraid they might not like the idea.,表不可能(猜测推测),cant, couldnt may not
7、, might not,否定句,can, could, be able to,can, will, may, could, would, shall, might,must, may, might, can, could,mustnt, shouldnt, had better not,should, must, have to, ought to,能力,能够,许可,征询意见,猜测，可能性,禁止,义务,应该,- May I ask you a question? -No, you mustn t . （No, you may not. /You can t） -Must I do it rig
8、ht now? -No, you needn t.,翻译下列句子, 体会情态动词的不同用法:,Tom, you mustnt leave all your clothes on the floor like this! 2. He must have completed his homework; otherwise, he couldnt be enjoying himself by the seaside.,(表示禁止, 意为 “不许”),(must+ have+过去分词, 表示对过去事情肯定的推测),3. Helen may go on the trip with us, but she
9、 isnt quite sure yet.4. - Isnt that Anns husband over there?- No, it cant be himIm surehe doesnt wear glasses.,(表示可能性, 意为 “可能”),(对目前状态表示否定推测, 意为 “不可能”),5. I often see lights in that empty house. Do you think I should report it to the police? 6. Children under 12 years old in that country must be und
10、er adult supervision when in a public library.,(表示应该),表示义务或必要, 意为 “必须”,7. -Who is the girl standing over there? - Well, if you must know, her name is Mabel. 8. -Ill tell Mary about her new job tomorrow. -You should have told her last week.,表示主张, 意为 “一定要”,表示与过去事实的相反, 意为 “本应该”,9. You cant imagine that
11、 a well-behaved gentleman should be so rude to a lady.10. The interest shall be divided into five parts, according to the agreement made by both sides.,表示吃惊, 意为 “竟然会”,(表示义务或规定),11. - Is John coming by train? - He should, but he may not. He likes driving his own car.12. Since it is raining, we have t
12、o stay indoors. 13. I must go now. There are a lot of things I want to do.,(表示对现在或将来的推测),(表客观需求),(强调主观意图),14. There must be some reason for his absence.15. - Need I do the experiment again after class?- Yes, you must. (No, you neednt/ dont have to.),(表示对现在事情的推测),need引起的疑问句肯定回答用must.,Practice,1. _ I
13、water the trees on Tuesday? No, you neednt. A. Can B. Must C. May D. Shall,2 _ I turn on the radio?Youd better not. It is noisy enough in this room. A. Shall B. Must C. Need D. Do 3. Lets go to the library this afternoon, _? A. shall we B. will we C. can we D. should we,4. Everyone _ do his best to
14、make the world safe and clean. A. can B. may C. should D. had to 5. _ to have lunch with us today? A. Do you like B. Would you like C. Will you like D. Have you like,高考链接,1. I often see lights in that empty house. Do you think I _ report it to the police? (2004全国卷III)A. should B. may C. will D. can
15、2. Tom, you _ leave all your clothes on the floor like this! (2005全国卷I)A. wouldnt B. mustnt C. neednt D. may not,A,B,3. Must we finish copying all these articles this morning?No, you _.A. mustnt B. havent C. not have to D. dont have to,D,4.- Mum, Ive been studying English since 8 oclock. _ I go out and play with Tom for a while?- No, Im afraid not. Besides, its raining outside now.A. Cant B. Wouldnt C. May not D. Wont 5.I _ pay Tracy a visit, but Im not sure whether I will have time this Sunday.A. should B. mightC. would D. could,
