情态动词复习,can, could,1) 表示能力（体力、知识、技能）。 Can you skate? Can you lift this heavy box? Mary can speak three languages. She could read poems when she was three.,体力,技能,知识,过去的能力,能,2) 表示请求和允许,-Can/May I go now? -Yes, you can. -No, you cant. -不， 不行 或 - No, you mustnt. - 不， 不准 - Could I come to see you tomorrow? (婉转语气， 不表过去时）,此时可与may互换,可以,may, might 表示请求和允许 -May I smoke in this room? -Yes， you may. - No, you cant. 或 No，you mustnt.,此时可与can互换,可以,must,1) 表示必须、必要。是说话人的主观看法 You must come in time. - Must we hand in our exercise books today? - Yes, you must. - No, you neednt. -No，you dont have to .,必须,must 与 have to区别,must译为“必须” 而have to多表示客观存在的环境所限,即客观要求 (无奈)而为之，多译为“不得不干某事” I must clean the room because there are too dirty. I have to leave school because my family is poor now. If I buy that car, Ill have to borrow some money.,（无人强迫）,（无耐）,表示推测、可能性,might-may-must 也许、 可能、 一定 1He might be very busy now. 2He may be very busy now. 3. He must be very busy now. 表示推测的否定形式只有cant.,不可能或肯定不,1 Youre Toms good friend, so you _ know what he likes best. 2 -Are you going to Beijing by plane? - I am not sure. I _ take a train.,Need,1.需要做 need to do 2. neednt 不必 You neednt worry about it.,四、 shall 与should,shall 用于第一人称，征求对方的意见。 shall I clean the room for you? 2）should 表示应该做 You shouldnt watch TV every day。,1. -_ you play golf? -No. But I can play table tennis.,A. Can B. May C. Must D. Should,2.-Could I go to the movie this weekend, Dad? -Yes, you _. But you have to come back before nine.,A. shall B. must C. need D. can,3. -Is John coming by train? -He should, but he _ not. He likes driving his car.,A. must B. can C. may D. need,4.-Could I use your pen? -Of course you _.,A. must B. may C. can D. need,5. -Will you stay here for dinner? -Sorry, I _. I have something important to do.,A. dont B. didnt C. neednt D. cant,6. -Is your brother playing computer games, Ted? -He _ do that because the computer doesnt work.,A. may not B. cant C. mustnt D. neednt,7. -David, is that man your head teacher? -It _ be him. Hes the tallest in our school. But that man is short.,A. mustnt B. cant C. neednt D. wont,8. John, you neednt do your work today, you _ do it tomorrow if youre tired.,A. must B. may C. cant,9. -Are you going to Beijing by plane? - So I am not sure. I _ take a train.,A. should B. may C. must D. will,10. -_ I swim in that river? -No, you _. Its dangerous to swim in it.,A. Must; cant B. Can; may not C. May; mustnt,11. -Mom, _ I play computer games? -Yes, you can. But you have to finish your homework first.,A. must B. may C. will D. need,12. -Must I stay at home and take care of her? -No, you _.,A. mustnt B. wont C. cant D. neednt,13. -Must I go and do it now? -No, you _. We still have two more days.,A. shoudnt B. cant C. neednt D. wont,14. Its nearly seven oclock. Jack _ be back home at the moment.,A. must B. need C. could D. can,15. -May I do the rest of the work tomorrow? -Yes, of course. You _ finish it today.,A. must B. mustnt C. neednt,16. You have already tried your best, so you _ worry about the matter.,A. cant B. neednt C. mustnt D. couldnt,17. You look tired now. You _ stay at home and have a rest.,A. had to B. had better C. would like to D. would rather,