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1、Grammar,情态动词用法,用法： A. 表能力：（= be able to） eg. The girl can dance very well. B. 表可能性: eg. Can the news be true? C. 许可: eg. Can I sit here?,can 和could：能,cant /couldnt:不能,如：Can you understand the different kinds of English these people are using?Two years later, he was able to speak very good Chinese.,2
2、) could的主要用法是： A. could 是can的过去式 e.g. We all knew that the young man couldnt be a doctor. B. could表示请求, 语气较can委婉:,Could you lend me your dictionary?,以could或would提问时，不能再以could或would作答，而应该用can或will。如：Could I borrow your dictionary?Yes, of course you_,补充,can.,may 和might ：可能 may ： A. 表请求，许可 e.g. May I c
3、ome in ? B. 表猜测: “也许” “可能”,The guest may arrive this afternoon.,C. 表示祝愿 e.g. May you succeed! May you have a good journey! might : 可能性要比may 小。,Helen _ go on the trip with us, but she isnt quite sure yet. A. shall B. must C. may D. can,C,will和would：,will 1.将来 e.g. I will tell you something important.
4、 我要告诉你一些重要的事。,2. 意志，决心，请求，,Will you tell her that Im here? 请您告诉她说我在这儿，好吗？,Will you type this, please? 请打印这个, 好吗？ Wont you sit down? 请坐下, 好吗？ 3. would比will客气委婉。 e.g.: Would you help us, please? 请您帮助我们，好吗？,（表请求）,shall,shall 1.征求对方的意见。 e.g.: Shall we go by train, Mom? 妈妈，我们乘火车去好吗？ 2. 用于第二，三人称陈述句，表命令，警告
5、，允诺，或威胁。 You shall fail if you dont work harder.,Mr Brown, many students want to see you. _ they wait here or outside? A. Shall B. Will C. Can D. Would,A,What does the sign over there read?“No person_ smoke or carry a lighted cigarette, cigar or pipe in this area,”A. will B. mayC. shallD. must,C,mus
6、t; cantYou _ have stayed up. You look so tired.You _ be 45! I thought you were about 25 years old.,must,cant,must:一定,肯定mustnt:禁止，不允许”,neednt或dont have to: 不必,我一定要完成所有工作吗？MustIfinishallassignments?,Yes,_ No,_,you must.,youneednt.,must; cantYou _ have stayed up. You look so tired.You _ be 45! I though
7、t you were about 25 years old.,must,cant,should: 应该 eg: You should keep your promise. 你应该遵守诺言。 She should have passed the exam. 她应该通过考试的。,I think Ill give Bob a ring later in the week. You _. You havent been in touch with him for ages. A. will B. may C. have to D. should,D,I. Choose the correct answ
8、er.,练习坊,1. Must we clean the house now? No, you _.A. neednt B. may not C. mustnt D. cant2. You_return the book now. You can keep it next week if you like.A. cant B. mustnt C. neednt D. may not3. Johnny, you _play with the knife, you_hurt yourself.A. wont.cant B. mustnt.may C. shouldnt, must D. cant.shouldnt,A,C,B,John, look at the time. _ you play the piano at such a late hour? A. Must B. Can C. May D. Should,A,There _ any difficulty about passing the road test since you have practiced a lot in the driving school. A. mustnt be B. have C. shouldnt be D. neednt have,C,The end,
