初中英語(yǔ)情態(tài)動(dòng)詞專(zhuān)項(xiàng)講解(文件)
【正文】 n’t leave his 。4.（1）needn’t意為“不必”。5. shouldn’t表示不應(yīng)該。You needn’t get up so early every ?？键c(diǎn)五:情態(tài)動(dòng)詞表示推測(cè)的用法:一、“情態(tài)動(dòng)詞+動(dòng)詞原形”表示對(duì)現(xiàn)在的推測(cè)。The man may be the headmaster.—Where is Mr Li?—He might be working in his office. —May Mr Li e?—He might not e here.Could表示推測(cè)時(shí)，語(yǔ)氣can比要弱，說(shuō)話(huà)者留有余地。如：She must have seen the film before，hasn’t she?(注意反意疑問(wèn)句的后半部分)You must have met uncle Wang in the shop yesterday，didn’t you? (注意反意疑問(wèn)句的后半部分)“should +have done /been”表示“本應(yīng)當(dāng)做某事，而實(shí)際上并沒(méi)有做”；“shouldn’t+完成式”表示“本來(lái)不應(yīng)當(dāng)做，而實(shí)際上卻做了”。I saw him just now. He can’t have gone to Japan.She said the man couldn’t have stolen her car.“could +have done/been”表示“過(guò)去本來(lái)能夠，可以做某事或成為某種狀態(tài)，而實(shí)際上沒(méi)有”，說(shuō)話(huà)者有些遺憾。另外be able to常常指經(jīng)過(guò)努力，花費(fèi)了時(shí)間和勞力之后才能做到某事。He has been able to 。如：Can/ May I help you ? 我能幫助你嗎？ 2. can和may表示可能性時(shí)的區(qū)別：1)在肯定句中用might，may，must，不用can2)在疑問(wèn)句中表示推測(cè)用can，不用might，may，must3) 在否定句中用can’t（不可能），不用may，must。易混點(diǎn)四：can’t和mustn’t1. can’t根據(jù)其基本用法可譯為：（1）不會(huì)。（3）否定句中表示推測(cè)。 易混點(diǎn)五：must和have to 。I haven’t got any money with me, so I’ll have to borrow some from my friend.我身上沒(méi)帶錢(qián)，只好向朋友借點(diǎn)了。易混點(diǎn)六: used to do / be used to doing / be used to do…/ be used for doing sthused to do表示過(guò)去常常發(fā)生的動(dòng)作，強(qiáng)調(diào)過(guò)去，只用于過(guò)去，注意用to do，不用doing形式；be used to doing意為“習(xí)慣做…”，be可有各種時(shí)態(tài)；be used to do意為“……被使用去做……,”為被動(dòng)語(yǔ)態(tài)形式。A knife can be used for cutting things.(刀可以用來(lái)割東西)/ A knife can be used to cut things.(刀可以用來(lái)割東西)。She is used to eating 。3. have to可以用于多種時(shí)態(tài)；而must只用于一般現(xiàn)在或?qū)?lái)。如：I know I must study 。2. mustn’t意為“禁止、不許”，用來(lái)表達(dá)命令，表示強(qiáng)烈的語(yǔ)氣。（2）不能。Where can they be now? 他們現(xiàn)在可能在哪兒？ That can’t be true. 那不可能是真的。We were able to reach the top of the mountain at 。He could speak English at 。You could have stayed with the Smiths while you were in New York (but in fact you stayed in a nearby hotel .) Could Mr Li have helped this girl student?“may/might+完成式”表示“過(guò)去可能，本來(lái)可以于某事而實(shí)際上沒(méi)有干”，might的可能性較小，語(yǔ)氣較弱。You should have finished your homework earlier (but in fact you did not finish it on time).You shouldn’t have gone to bed when you woke up at five (but in fact you went to bed again then).“needn’t+完成式”表示“本來(lái)沒(méi)有必要做某事，而實(shí)際上卻做了”。It is already 10 o’clock now they should be there.二、情態(tài)動(dòng)詞表示對(duì)過(guò)
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