Grammar Modals for Guessing,Objective,To use the following modal verbs correctlymust may may not might cant could,Have A L k,1. I think my French tutor might know 2. They must be so frightened!3. They may have been separated from4. Or they could have gone exploring5. They cant be there.6. they may not have any water.,Sentences from this lesson:,1. I think my French tutor _ know 2. They _ be so frightened!3. They _ have been separated from4. Or they _ have gone exploring5. They _be there.6. they _not have any water.,Fill in the blanks.,might,must,may,could,cant,may,Practise,1. In fact, China _ have the largest number of English learners. 2. Black people _ not vote or choose their leaders. 3. You _ pay more attention to the rainforest. 4. But of course you _ ask any questions you like. 5. You _ be very proud.,should,may,could,can,must,6. Most ancient festivals _ celebrate the end of cold weather, 7. or to satisfy the ancestors, who _ return either to help or to do harm.8. For the Japanese festival Obon, people _ go to clean graves 9. this _ lead the ancestors back to earth.10. Festivals _ also be held to honour famous people.,would,might,should,will,can,may /might/could have +PP(过去分词)must have +PP(过去分词),must be + noun / adjmay be/ must be + v-ingmust +v(原形),对过去的推测,对现在的推测,情态动词表推测,cant have + PP(过去分词)cant have been+noun / adj,对过去的推测,对现在的推测,cant be + noun / adjcant +v(原形),情态动词对现在表推测,1. must在肯句中表很有把握的推测(不太确定用may, might, could)：They must be having a very good time with their kids.,否定句或者疑问句中表推测必须用 can/could, 不可以用 must。He cant be at home, for the door isclosed.,a.表示“允许”或“请求”。e. g. He may come if he likes.,2. may的用法:,在使用这一用法时需注意: may的否定回答用must not。May I take this book out of the reading room？No, you mustnt.,b.表示说话人的猜测，认为某一事情“或许”或“可能”发生。 e. g. He may know the answer,c. may用在感叹句中可表示祝愿、愿望。 e. g. May you succeed(祝你成功。) May you have a pleasant journey (一路平安。),d. may/might (just) as well 还是的好； 到不如,No one will eat this food, it might just as well be thrown away.(2) Now that you have got a good chance, you might just as well make full use of it.(3) Its no good waiting for the bus. We might as well walk.,一、 “must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。 1. The river is rising. It must have rained last night.2. She looks very happy. She must have passed the exam.,情态动词+have done 对过去表推测的用法,二、 “cant+have+done”表示对过去事情的否定推测，译成“不可能做过某事”。 I saw Mary in the library yesterday. You cant have seen her. Shes been abroad.2. Do you know where David is? I couldnt find him anywhere. Well, he cant have gone far. His coat is still there.,三、 “can+have+done”表示对过去行为的怀疑，用于疑问句，译成“可能做过吗？”1. There is no light in the room. Can they have gone out? 屋里没有灯，他们可能出去了吗？2. There is nowhere to find them. Where can they have gone? 到处找不到他们，他们可能到什么地方去呢？,四、“could+have+done”是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。1. Thank you for all your hard work last week. We dont think we could have managed it without you.2. Given more attention, the trees could have grown better.,五、 “may+have+done”表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。 What has happened to George? I dont know. He may have got lost. 乔治发生了什么事？ 我不知道，他可能迷路了。,六、 “might+ have+ done”表示对过去事情的推测，might与may意思相同，但可能性更小。多用于虚拟语气结构中。 1. He might have given you more help, even though he was busy. (MET90) 他或许会多给你一些帮助，即使他很忙。2. Mary might have learned some Chinese before.,注：另附word文档，点此链接,1. _ you interrupt now? Cant you see Im on the phone? Sorry Sir, but its urgent. (2012重庆) A. Can B. Should C. Must D. Would2. One of our rules is that every student _ wear school uniform while at school. (2012辽宁) A. might B. could C. shall D. will,高考链接,3. I _ use a clock to wake me up because at six oclock each morning the train comes by my house. (2012全国) A. couldnt B. mustnt C. shouldnt D. neednt4. Im going to Europe on vacation together with John if I _ find the money. (2012全国II) A. can B. might C. would D. need,根据所给汉语提示完成下列句子, 每空一词。1. 你哥哥不可能已经找到他的车，因为今天早上他是坐公共汽车来上班的。 Your brother _ _ _ his car, for he came to work by bus this morning.2. 约翰，你一定不要玩刀子，你会伤害自己的。John, you _ play with the knife, you _ hurt yourself.,cant,have,found,mustnt,may/might,3. 她结婚时一定很年轻。She _ _ _ very young when she got married.4. 我没有赶上早班车，他们一定等我等得不耐烦了。I havent caught the early bus. They _ _ _ for me impatiently.,must,have,been,must,be,waiting,5. I dont know where she is, she _ _ (可能在武汉).6. At this moment, our teacher _ (想必在批改) our exam papers.7. The road is wet. It _ (肯定下雨了) last night. 8. Your mother _ _ (一定一直在找你).,