1、Grammar and function,预习检测,1.1）表示能力 2）表示允许 3）表示允许（委婉语气） 4）表示推测5）表示推测 6）表示偶尔，有时会 2.1）询问或说明一件事可不可以做 2）询问或说明一件事可不可以做 3）表示推测4）may/might as well do 不妨做某事，最好做某事。 3.1）表示必须要做的事 2）禁止 3）表示肯定的推测 4）偏偏，偏要（表示与说话人愿望相反或不耐烦） 4. 1）表示将来 2）表示习惯，总是 3）表示过去的习惯 4）表示意愿，意志，决心等。5）表示功能,能，行 6）表示询问对方的意愿或向对方提出要求 7）表示揣测,5.1）用于第一人称，
2、表示将来。 2）在问句中，一、三人称表征求对方意见 3）肯定句中，二、三人称，表示说话者的意图、允诺、警告、决心、命令等。 6. 1）表示应该，应当 2）表示虚拟 3）表示可能性，该，可能 4）表示惊讶，遗憾等，竟然会 7.1）表示需要，主要用于否定句和疑问句中。2）表示需要，主要用于否定句和疑问句中,合作探究,Task1: 1.1) be able to 2)have been able to 3)was able to 4)can Be able to 有多种时态形式，而且可以和其他情态动词连用，can /could 不可以。 Be able to 暗示经过努力才具备的能力，can 表示本
3、身具有的做某事的能力。 2.1) must 2)had to Must 表示主观想法 have to 表示客观需要 Have to 有更多的时态变化 3.1）would 2) used to 3）used to Used to着眼于过去和现在的对比，强调现在不再是这样了。 Would 只能用于表示过去的习惯性动作，不能表示过去的状态。,Task2: 1.1）must 2)cant 3)can 4)may/might 5) may/might 常见表示推测判断的情态动词：must (口气最强，只能用于肯定句中)can(常用否定和疑问句中)may (口气j较弱) might (口气最弱) 2.1)
4、 may/might 2) may/might be 3) may/might have been 4)must be 5)must 6)must have 7)cant have 以May为例，may do 对一般现在的推测may be doing 对正在发生事情的推测may have done 对过去发生的事情的推测 3.有明显的表示过去的时间状语时，变反义疑问句用过去式,针对性练习,1. can 2. would 3.must 4.May /might/can 5.used to have is used to having 6.must be 7. should 8.cant have
5、,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? 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
6、 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 I have a word with you?,语气,强 弱,表许可,征询意见,can, will could / may / would / shall / might,There must be a mistake. You may walk ten miles w
7、ithout seeing a house. He might get there on time. It can be true. In those days few workers could support their families.,表可能性(猜测),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 no
8、t like the idea.,表不可能(猜测),cant, couldnt may not, might not,否定句,mustnt, shouldnt had better not,We mustnt waste our time. They shouldnt left so soon. Youd better not disturb him.,表禁止,You should do what your parents tell you. If you cant finish the book by then, you must come and renew it. This is a l
9、ovely party, but we have to go because of the baby-sister. The bridge was not wide enough so that somebody had to give way.,should, must have to,表义务(应该),有时态变化,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 cou
10、ldnt 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 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
11、 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 under 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 t
12、ell 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 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”
13、,(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 to 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 d
14、o 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.,Underline the correct verb and try to translate the sentences into Chinese.,1. You should/shouldnt visit the Three Gorges. Theyre beautiful. 2. Boats can/cant reach the upper part of
15、 the Yangtze River. Its too dangerous. 3. You should/shouldnt go in winter. The waters too low.,4. Travelers must/mustnt show their documents when they arrive. Its the law. 5. They could/couldnt see the mountains in the distance. The peaks were shining in the sunlight.,6. The children could/couldnt
16、find their way out of the woods. They were lost. 7. Peter had to/must return by the end of February. He started work again in March.,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 d
17、ont can be there tomorrow.They should may do that.,should,must,cant,should / may,Practice 历年高考题,- 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. WouldntC. May not D. Wont,2. I _ pay Tracy a visi
18、t, but Im not sure whether I will have time this Sunday.A. should B. mightC. would D. could,Children under 12 years of age in that country _ be under adult supervision when in a public library.A. must B. may C. can D. need You _ be tired youve only been working for an hour.A. must not B. wont C. can
19、t D. may not,5. You might just well tell the manufacturer that male customers _ not like the design of the furniture.A. must B. shall C. may D. need,A left-luggage office is a place where bags _ be left for a short time, especially at a railway station.A. should B. can C. must D. will,7. - Excuse me
20、, 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 not C. neednt D. shouldnt,8. Hundreds of jobs _ if the factorycloses.A. lose B. will be lost C. are lost D. will lose,9. Rainforests _ and burned at such a speed that they will disappear from the earth in the near future. A. cut B. are cut C. are being cut D. had been cut,10. The first use of atomic weapons was in 1945, and their power _ increased enormously ever since.A. is B. was C. has been D. had been,
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