【導(dǎo)讀】只作情態(tài)動詞的can/could,may/might,表示推測時，只能用于肯定句。這個電腦肯定出了問題。他們買了一輛新車。他們在玩籃球，他們一定完成了作業(yè)。昨天晚上一定下雨了。beableto可以用于各種時態(tài)。could用于表示泛指過去的能力。事時，只能用was/wereableto，不能用could。這個人不可能是瑪麗，她生病了。她不可能在說謊。剛才我還看見他了，所以他不可能出國的。門是鎖著的，所以她不可能在家。于肯定句中，表示對過去發(fā)生的事情做出的判斷，你本來可以考的更好。在或?qū)硪l(fā)生的動作把握不大。她們明天可能會到這里來。可用于指過去的行為或者表示可能性更小。我問他我是否可以離開。他可能已經(jīng)從報紙上知道這個消息了?？烧髑髮Ψ降脑S可。5）用于祈使句，表示祝愿。用于第二、三人稱陳述句中，表示說話人給對方的命令，警告，允諾或威脅。

　　

【正文】 B. can。 can。 must C. can。 mustn’t。 must D. must。 mustn’t can 2. Isn’t that Ann’s husband over there? No. it ____ be himI’m sure he doesn’t wear glasses. ’t B. must not C. wont D, may not can I e for the photos? I need them tomorrow afternoon. They ____ be ready by 12:00. A. can B. should C. might D. need you ing to Jeff’s party? I’m not sure. I ___ go to the concert instead. A. must B. would C. should D. might A A B D 策劃：《學(xué)生雙語報》 53 may laugh, but I’ve been thinking of being a vegetarian. Oh, you ____ be out of your mind. You will be hungry all the time. A. will B. may C. must D. should wonder why they are late? They _____ the train. ’t have missed B. could miss C. must have missed D. might miss me your permit, please! Oh, it’s not in my pocket. It ______. A. might fall out B. could fall out C. should have fallen out D. must have fallen out C C D 策劃：《學(xué)生雙語報》 54 7. 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. can’t e D. won’t be ing has two sides. Beautiful songs, sometimes, ___ be just noise to others. A. must B. may C. should D. could 9. There were already five people in the car, but they managed to take me as well. It ___ a fortable journey. ’t be B. mustn’t have been C. should be D. couldn’t have been must have the largest number of speakers, ____. ’t they B. haven’t they C. don’t they D. didn’t they B B D C 策劃：《學(xué)生雙語報》 55 ?could(不用 can)+have done,在肯定句中表示 “ 本來能夠 … 而沒能 …” ，具有婉轉(zhuǎn)的批評和責(zé)備之意。 1. I could have passed my exam easily, but I made too many stupid mistakes. 我本來能夠輕易通過考試，但我犯了太多不該 犯的錯誤。 could have reported to me earlier. 你本該早點告訴我的。 策劃：《學(xué)生雙語報》 56 should/ought to+have done用于肯定句時，表示 “ 本該做某事而實際上沒做 ” ，用于否定句時，則表示 “ 不該做的事反而做了 ” 。 should have told him a week ago. 你本來應(yīng)該在一周前告訴他的。 ought not to have taken the magazine out of the reading room. 他不該、把雜志帶出閱覽室的。 策劃：《學(xué)生雙語報》 57 ?might（不用 may） +have done表示 “ 本來可能 …” ，但實際上沒有發(fā)生的事。另外，還可表示 “ 本來應(yīng)該或可以做某事 ” 之意，含有輕微的責(zé)備語氣。 might not have told her. 你本可以不告訴他的。（事實上你告訴他了） 2. You might have e earlier. 你本可以早點來的。（但沒有這樣） 策劃：《學(xué)生雙語報》 58 ?needn’t +have done表示做了本來不必去做的事。 needn’t have gone to the station yesterday. 昨天她本不必到火車站去的 .（昨天她去了） needn’t have bought it. 你本可不必買它的。 （你買了） 策劃：《學(xué)生雙語報》 59 ?鞏 固 練 習(xí) , I’m not feeling well in the stomach. I ____ so much fried chicken just now. A. shouldn’t eat B. shouldn’t have eaten C. mustn’t eat D. mustn’t have eaten hasn’t Jane arrived yet? She ____ again in the morning? A. shouldn’t have overslept B. may have turned off the alarm clock C. must have no one t o call her D. should have someone to wake her up you go to the movie the day before yesterday? No. We ___, but we decided not to. have gone B. could go C. should go D. could have gone BB A 策劃：《學(xué)生雙語報》 60 it turned out to be a small house party, we ____ so formally. ’t dress B. didn’t have to dress up C. Might not have dressed up D. needn’t have dressed up ’m rather surprised you haven’t reported him to your teacher. In my opinion, you ___ this as soon as you found out he was cheating. A. must have done B. might have done C. should have done D. could have done D