Unit2Lesson2UsinglanguageModals(2)Revision情态动词课件-高中英语外研版（2019）必修第二册

1、Unit 2 Lesson 2Using languageModals (2)Revision情态动词(Modal verbs)是本身有一定的词义，表示语气的单词。但是不能独立作谓语，只能和动词原形一起构成谓语。情态动词用在行为动词前，表示说话人对这一动作或状态的看法或主观设想。Presentationmay&might1.表示请求获取许可可用May I.? Might I? 表示请求获取许可；Might I 比May I 更委婉；此时Might不是May的过去式；May/Might I borrow your hat? 我可以借你的帽子吗？2.表示说话者给予许可在对话中表示说话者给予许可时可

2、用may，可给予现在或将来的许可，might无此用法。Amy, you may go now. 艾米，你现在可以走了。（可表示说话者在给艾米许可）He may use my phone. 他可以用我的电话。（可表示说话者在允许他用电话）3.描述某人具备许可做某事描述某人具备许可做某事时，可用may表示现在或将来的许可，常用在在正式场合，如官方用语、合同用语等；用might表示过去的许可 The applicant may appeal. 申请者可上诉。 In certain circumstances, a police officer may ask a driver to pull ove

3、r. 在某些情况下，警察可要求司机停车。4. 表示推测可用may或might表示对现在或将来的推测，表示说话人对此不太确定You may/might be right. 你可能是对的。This gift may/might surprise her. 这礼物可能会让她惊喜。If you ask me, I may/might say yes. 如果你问我，我可能会说是。can /cant /could /couldnt1.表示能力 can表示现在的能力；could表示过去的能力She can read. 她会识字。Andy cant speak English fluently. 安迪不会流利

4、地说英语。When I was young I could jump high. 当我年轻的时候我能够跳的高。She couldnt read when she was still a child. 当她还是小孩的时候，她不识字。2.表示条件允许，就可以做到的事情，可发生的事情can表示现在或将来可发生的事；could表示过去可发生的事The cake can be big or small. 蛋糕可大可小。Years ago we could see the river from here. 很多年前，我们在这里就可以看到河。3.表示请求他人做某事可用 Can you? Could you?

5、 表示请求他人做某事。Could you 比Can you 委婉，此时could不是can的过去式Could/Can you give me the book? 请把书给我，好吗？Could/Can you open the window please? 请开窗，好吗？4.表示请求获取许可可用 Can I? Could I? 表示请求获取许可。Could I 比Can I 更常用；此时could不是can的过去式Could/Can I have a word with you? 我可以和你说几句话吗？Could/Can I use your phone? 我可以用你的电话吗？5.表示说话者给予

6、许可在对话中表示说话者给予许可时可用can，可给予现在或将来的许可，could无此用法。Amy, you can go now. 艾米，你现在可以走了。（可表示说话者在给艾米许可）He can use my phone. 他可以用我的电话。（可表示说话者在允许他用电话）6.描述某人具备许可做某事描述某人具备许可做某事时，可用can表示现在或将来的许可，用could表示过去的许可All of us can go now. 我们现在都可以走了。He said we could leave. 他说我们可以离开。7.表示推测用“cant be” 表示“不可能”，表示对现在或将来的推测，体现说话人非常肯

7、定某事是不可能发生的；The price is too high. That cant be right. 价格太高。那价格不可能是对的。Andy is on holiday. He cant be at work. 安迪在度假，他不可能在上班。must/ mustnt1、表示“必须”，多强调说话人的主观看法。2、must和have to 的区别：（1）must表示说话人的义务或说话人主观认为“必须，应当”做某事；have to表示由于某种外界原因而“必须，不得不”做某事。即must侧重说明主观看法，have to强调客观需要。（2）must只有一种形式，可用于现在、过去或将来时，但have

8、to有不同的形式，可用于不同的时态。（3）在否定句中，dont need to, dont have to, neednt表示没有义务；mustnt表示禁止。3、must的否定形式must not/ mustnt 意为“不许，禁止”，表示绝对禁止。若表示“没必要，不必”，应使用neednt或dont have to。注意：对must作否定回答时，不用mustnt，用neednt或dont have to。4、must 表示“偏偏”，指令人不快的事情。5、must用来表示推测，意为i“准是，肯定是”，一般用于肯定句，肯定程度比may,might大的多。Practice 1. You _ retu

9、rn the book now. You can keep it till next week if you like.A. cant B. mustnt C. neednt D. may not2. Where is my pen? I _ it.A. might lose B. would have lost C. should have lost D. must have lost3. I wish I _ you yesterday.A. seen B. did see C. had seen D. were to see4. I didnt hear the phone. I _ a

10、sleep.A. must be B. must have been C. should be D. should have been5. If my lawyer _ here last Saturday, he _ me from going.A. had been; would have prevented B. had been; would prevent C. were; would prevent D. were; would have prevented6. He _ you more help, even though he was very busy.A. might ha

11、ve given B. might have C. may have given D. may give7. If it _ for the snow, we _ the mountain yesterday.A. were not; could have climbed B. were not; could climbC. had not been; could have climbed D. had not been; could climb8. Without electricity human life _ quite difficult today.A. is B. will be

12、C. would have been D. would be9. A computer _ think for itself, it must be told what to do.A. cant B. couldnt C. may not D. might not10. Jenny _ have kept her word. I wonder why she changed her mind.A. must B. should C. need D. wouldKey: 1-5CDCBA 6-10ACDABExercise 1.Look at the sentences from the re

13、ading passage and answer the questions.a That is why Letters from Father Christmas could be the perfect book.b The children must have been very excited as they opened it.C. they might not receive their presents if they were not good.Q:1 What do the words in bold indicate: an order, a request, abilit

14、y or possibility?Q2 Will the meaning of sentence (a) change if we replace could with must or might?Q3 What happens if we change must and might in sentences (b) and (c) into could?Now look for more sentences with modals in the reading passage.2.Rewrite the underlined sentences in the coversation usin

15、g can/cant,may/might and must.(At a fancy dress party.)Chris: I spent ages putting up all the balloons and flowers last night.Jean: I expect you are feeling tired now! You must feel tired now.Chris: Yes, I am. Look, that guy is dressed as Batman. Is that Mike?Jean: Its possibly him. It may be him.Ch

16、eck out that girl over there. Im sure thats Lucy. It must be Lucy.Chris: No, I dont think thats Lucy. It cant be Lucy.Lucy isnt that tall.Jean: Look at those two guys dressed as chickens! Oh,theyrewaving at us! Maybe theyre from our school. They may be from our school.Chris: Lets go and find out.3.L

17、ook at the picture amd make as many sentences as possible using can/could,may/might and must.Black Friday is one of the busiest shoppingdays of the year.Storeshave big sales and open their doors very early.SummarySummarize what we have learnt today.Homework1. We _ last night, but we went to the conc

18、ert instead.A. must have studied B. might study C. should have studied D. would study2. Could I borrow your dictionary? Yes, of course you _.A. might B. will C. can D. should3. Tom ought not to _ me your secret, but he meant no harm.A. have told B. tell C. be telling D. having told4. If he _, he _ that food. Lucki