1、Can 的用法：1. 表示能力: “能够” “会” ( 1)过去式: could 2) 注意与 be able to 的区别 )2. 用于猜测句型的疑问句和否定句中 (= could) : cant +v(现在) / cant+have done (过去)3. 表示 “有时会.”4. cant 与 too 或 enough 连用, 表示”越越.好” “怎么也不为过”5. 用于征求许可,相当于 may , may 客气委婉些, can 随便些 , 此时也可用 could 表示委婉语气,但答语必须用 canExercises:1. Facts prove that the worlds econo
2、mic development is not a win-lose game but one in which all_ be winners.A. can B. shall C. must D. would2. If it were not for the fact that you _ sing, I would invite you to the party.A. couldnt B. shouldnt C. cant D. might not 3. The World Wide Web is sometimes jokingly called the World Wide Wait b
3、ecause it _ be veryslow.A. should B. must C. can D. will4. As is natural, a man as old as he _ be very forgetful.A. should B. can C. must D. would5. The temperature in our city _ fall to 13 degrees centigrade below freezing in winter.A. shall B. can C. must D. should6. -_ I ask you something, if you
4、 are not too busy?-Yes, of course you _.A. Can, could B. Could, can C. Should, should D. Could, could7. You know he is not going to let us leave early if we _ get the work done.A. cant B. may not C. shouldnt D. mustnt8. -Do you think the boy _ be in the school library?-Im not sure.A. must B. should
5、C. need D. can9.The fire spread quickly throughout the hotel, but they _ escape from it.A. can B. could C. were able to D. are able to 10.You know he is not going to let us leave early if we _ get the work done.A. cant B. may not C. shouldnt D. mustnt11.You _ pay too much attention to your reading s
6、kill, for it is that important.A. wont B. neednt C. cannot D. mustnt12.-Mum, I have been studying English since 8 oclock. _ I go out and play with Tom for a while.-No, Im afraid not. Besides, it is raining outside now.A. Wouldnt B. Dont C. Cant D. Mustnt13.-_ the film be on now?-It _ be, but Im not
7、sure.A. Can, may B. Must, neednt C. May, mustnt D. Can, cant (A)14.You _ Bob at this meeting yesterday, he has been on holiday in Paris for a week.A. mustnt have been B. shouldnt see C. cant have seen D. couldnt see15.It rained a lot during their journey, so they _ have had a good time.A. cant B. mu
8、st C. shouldnt D. might16. When he was young, his dream was to perform before great audiences, but he _.A. wouldnt B. neednt C. mustnt D. couldnt17.Safety in mining production is so essential and important that everyone _ take safety measures too seriously.A. cant B. mustnt C. shouldnt D. shant18.-_
9、he have been chosen as captain of our school football team?-Yes, he _. Cant you see hes wearing an armband (袖标)?A. Can, can B. Must, must have C. Can, must have D. Must, must 19.-I have taken someone elses T-shirt by mistake, Is it Janes?-It _ be hers. She seldom wears red.A. wont B. cant C. neednt
10、D. mustnt 20.When winter comes, _ spring be far behind?A. must B. should C. will D. can21.The importance of saving gas _ be stressed too much. Automobiles use up some 70 billion gallons of gas a year.A. shouldnt B. mustnt C. cant D. may not22.-Where do you think our guide _ be?-She was here only a moment ago.A. must B. should C. can D. would
