1、 本節課任務：本節課任務：掌握情態動詞的基本含義和虛掌握情態動詞的基本含義和虛擬語氣的基本句式擬語氣的基本句式 常用情態動詞：常用情態動詞：1. Can, could (1) 表示能力表示能力 Her mother can speak English （2)表示客觀可能性表示客觀可能性 Man cant live without air. （3）用以描述特有的行為或情形）用以描述特有的行為或情形 Generally speaking, he works hard, but sometimes he can be lazy （4）（）（ 用于否定句，疑問句或感嘆句中）表示驚異用于否定句，疑問句或

2、感嘆句中）表示驚異、懷疑懷疑、不相信的態度不相信的態度 How can you be so careless? It cant be done by him. (5) Can 表示請求和允許。表示請求和允許。Could 也可表示請求，語氣較也可表示請求，語氣較委婉，委婉， could 肯定答語應用肯定答語應用 can Can I go now? Yes, you can. Could I borrow your dictionary ? Yes, you can./ No, Im afraid not. （6）表推測，用在否定句和疑問句中：）表推測，用在否定句和疑問句中： 對現在情況的推測：對

3、現在情況的推測：He cant be at home. 對過去情況的推測：對過去情況的推測：He can/could not have been at home.*注意注意 * 1. Can 與與be able to 都表能力，都表能力，但是我們要表示經過努力但是我們要表示經過努力成功的干成某事應用成功的干成某事應用be able to The fire spread through the hotel very quickly but everyone was able to get out.2. cant ( can never) too 無論怎樣.都不為過,越.越好 You cant b

4、e too careful when you are crossing the road.Cant (help )but 意為“不得不，” 后接動詞原形I cant help but admit my mistake.3.can n. 容器，聽 a Coke can 可樂罐 garbage can垃圾箱 may, might1. 表示允許表示允許、請求時，請求時，might 比比 may 的語氣委婉的語氣委婉 - May I watch TV Now?- Yes, you may. (Yes, please )- No, you mustnt.( No, youd better not)Mig

5、ht I go with you? (語氣比用語氣比用 may 更委婉更委婉)2. 表祝愿表祝愿 May you succeed ! 3. 表示可能性He may be busy these days .The story may not be true.4. may/might+過去分詞的結構，表示對過去發生行為 的推測，是“也許會，也許是” 的意思。He may/might have missed the train.5. may/might as well,意為“不妨”。If that is the case, we may/might as well try.6.May / might

6、 well 很可能， 極有可能 Lisa may well not want to go on the trip she hates traveling.1.Helen _ go on the trip with us, but she isnt quite sure yet.A. Shall B. must C. may D. can CMust/ have to1. must 表示必須，應該 We must do everything step by step. mustnt 表禁止 You mustnt speak like that.2. must+動詞原形， 表示對現在或將來事情的推

7、測。 He must be at home, for the light is on. must+ have 過去分詞， 表示對過去事情的推測 It must have rained last night,for the ground is wet this morning.3.must 非要，偏要。常用于if you must 如果你非要 If you must smoke, do it outside.4.must表示的是人的主觀看法 have to 往往強調客觀 The play is interesting. I really must go now. I had to work wh

8、en I was at your age. Shall/should shall1.用于一三人稱疑問句,征求對方的意見或向 對方請示Shall we begin our lesson?When shall he be able to leave the hospital. 2.用于二三人稱的陳述句,表示命令,警告，強制，威脅，決心，允諾等.You shall fail if you dont work hard.He shall have the book when I finish reading.Should 1. 應該，應當= ought toHe shouldnt drink and

9、drive.2.（ 表示預期）應該會，可能 We should arrive before dark.3. 竟然。表示 說話人一種驚奇的語氣。 you cant imagine that a well-behaved gentleman should be so rude to a lady.Exercise:1. I often see the lights in the empty house.Do you think I _ report it to the police. A. should B. may C. will D. can2. I_ pay Tracy a visit, b

10、ut Im not sure whether I will have time this Sunday.A.should B. might C. would D. could3. Its nearly seven oclock. Jack_ be here at any moment.A. Must B. need C. should D.can4. The interest_ be divided into five parts, according to the agreement made by both sides,” declared the judge. A. may B. sho

11、uld C. must D. shall5.- Whats the name? - Khulaifi._ I spell that for you?A. Shall B. Would C.Can D. MightAACDAWill/wouldwill1. 表示請求，建議（ 用于第二人稱） Will you please go with me?2.（表示愿意）愿，要，會 If you will help me, I would appreciate it. 3 敘述在某種情況下是真實或可能的事 The door wont open. 4。表示某種傾向或習慣性動作。 Fish will die w

12、ithout water. Boys will be boys. 5.意志. Where there is a will, there is a way. 6. 遺囑 .I ought to make a will. Would 表示 提出請求，建議，想法時語氣比 will 更委婉 Would you like to have a cup of coffee?1 . - Write to me when you get home -_ . A. I must B. I should C. I will D. I can2.If you _ this paper with a more real

13、istic goal, I will reconsider your grade. A. rewrite B. rewrote C. will rewrite D. shall rewrite3.- Whats wrong with your pen? - The ink_ come out.A. wont B. didnt C. hasnt D. cantCCA情態動詞+ 完成式的用法1 “can(could )+ 完成式”的肯定式表示“本來能夠做而實際上未能做某事”。疑問或否定式表示對過去行為的推測。You could have done it better, but you didnt

14、try your best.He cant have been to that town. Where can he have gone? 2. “may(might)+完成式“ 表示對過去發生行為 不肯定的推測。 He may not have finished the work. She might have missed the train.3.” must+完成式“ 用在肯定句中，表示對過去發生的行為的推測，意為”一定“。He must have been to Shanghai.4. “neednt have done” 表示本來不必做某事而實際上做了。 You neednt hav

15、e watered the flowers, for it is going to rain.didnt need to do 指“沒有必要做而實際上也沒有做事”。I didnt need to clean the windows. My sister did it.5. “ should have done” 表示本應該做到而實際上沒有做到。 “ Shouldnt have done” 表示某種行為不該發生但卻發生了。You should have started earlier, but you didnt.He shouldnt have gone there.6. “ would ha

16、ve done” 表示本來要做某事卻沒做成。I would have written to you earlier but I have been ill. 5.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. may6. I _ have been more than six years old when the accident happened.A.shouldnt B. couldn

17、t C. mustnt D. neednt7. Theres no light on- they_ be at home. A. cant B. mustnt C. neednt D. shouldnt8.- I was riding along the street and all of a sudden ,a car cut in and knocked me down.- You can never be _ careful in the street. A. much B. very C. so D. tooABAD1.- My cats really fat. - You_ have

18、 given her so much food.A.wouldnt B. couldnt C. shouldnt D. mustnt2. My MP4 player isnt in my bag . Where _ I have put it ? A. can B. must C. should D. would3. I told your friend how to get to the hotel, but perhaps I _ have driven her there .B.could B must C. might D. should4. We_ have proved great adventures, but we have done the greatest march ever made in th