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1、Wang nuanfang,情态动词,Translation,我们今天必须交作业吗？,We must clean the classroom every day.,You mustnt talk to each other in class.,Must we hand in our homework today?,我们每天必须要打扫教室。,在教室里不允许交头接耳。,Must 表示义务，即“说话人认为某人做某事是必 要的”，译为“必须”Mustnt 表示“禁止，不允许，一定不要”,能把那些书递给我吗？,Translation,Can you pass me the books?,Some of
2、us can use the computer now,but we couldnt ten years ago.,现在我们一些人会（能）用电脑，但十年前却不会（能）。,Could you meet me at 3:00?,你能在三点钟来见我吗？,Can/could：“能够，可以”（表示说话人能，可以，同意，准许，以及客观条件许可）提出委婉的请求。,我可以进来吗？,Translation,May I come in?,You may take the book home.,你可以把这本书带回家。,他说他可以借我们一些钱。,He said he might lend us some money.
3、,May God bless you!,愿主保佑你！,May/might:“可以”（表说话人同意，许可，或请求对方许可）放在句首，表祝愿,一、must 的用法,Must,can/could,may/might表示推测、猜测与可能性的用法,对现在或将来情况的推测:must+bee.g.She is rehearsing a new play.She must be busy,Im sure.对现在或将来正在进行或发生事情的推测:must+be+V-inge.g.Xiao Ming must be watching TV now.对过去情况的推测：must+have+donee.g.No one
4、answers the phone bell.They must have already gone out.,二、can/could 的用法,Must,can/could,may/might表示推测、猜测与可能性的用法,（肯定句）表理论上的可 能性。“可能；有时会”,(否定句）“应该不是;不可能”,Cant have done 表示（过去）不可能做,(疑问句）“（到底）可能有这样的吗？,注意：could 不是can的过去时态，它也表示推测，但在语气上较为委婉或可能性要小一些。请体会：It can be better to stay here.It could be better to sta
5、y here.I dont know where Debbie is,she can be in the kitchen.I dont know where Debbie is,she could be in the kitchen.,Must,can/could,may/might表示推测、猜测与可能性的用法,三、may/might的用法,Must,can/could,may/might表示推测、猜测与可能性的用法,e.g.He may/might play the role of Beckham.,e.g.She may have called her sister.,e.g.He mig
6、ht understand it.,表示肯定推测时,各情态动词语气强弱如下：Must（一定）will（很可能）/would（很可能）ought to（应该，很可能）should（应该，很可能）can（可能）/could（可能）may（可能）might（可能）,情态动词表推测的用法,I dont know where she is,she may be in Wuhan.,情态动词+V原。表示对现在或将来的情况的推测，此时V常为系动词。,At this moment,our teacher must be correcting our exam papers.,情态动词+be+V-ing。表示对
7、现在或将来正在进行的情况的推测。,情态动词表推测的用法,情态动词+have+done。表示对过去情况的推测。,The road is wet.It must have rained last night.,Your mother must have been looking for you.,情态动词+have+been+doing。表示对过去正在发生事情的推测。,Mike cant have found his car,for he came to work by bus this mornig.,情态动词表推测的用法,She could be in the classroom.,推测的否定
8、式，疑问式用cant，couldnt 表示。,Exercises,1.-What _ it be?-It _ be a mail box,for it is moving.It _ be a car.A.can;cant;must B.can;can;must C.can;mustnt;must D.must;mustnt can 2.-Isnt that Anns husband over there?-No.it _ be him-Im sure he doesnt wear glasses.A.cant B.must not C.wont D,may not,A,A,3.-When ca
9、n I come for the photos?I need them tomorrow afternoon.-They _ be ready by 12:00.can B.should C.might D.need4.-are you coming to Jeffs party?-Im not sure.I _ go to the concert instead.A.must B.would C.should D.might,Exercises,B,D,5.-You may laugh,but Ive been thinking of becoming a vegetarian.-Oh,yo
10、u _ be out of your mind.You will be hungry all the time.A.will B.may C.must D.should6.-I wonder why they are late?-They _ the train.A.cant have missed B.could miss C.must have missed D.might miss7.-Show me your permit,please!-Oh,its not in my pocket.It _.A.might fall out B.could fall out C.should ha
11、ve fallen out D.must have fallen out,Exercises,C,C,D,8.-Has Mike started?He said he would join in the party.-He _.He is a man of keeping his word.A.could have left B.must have left C.cant come D.wont be coming9.Everything has two sides.Beautiful songs,sometimes,_ be just noise to others.A.must B.may C.should D.could 10.-There were already five people in the car,but they managed to take me as well.-It _ a comfortable journey.A.cant be B.mustnt have been C.should be D.couldnt have been,Exercises,B,B,D,
