【文章內(nèi)容簡(jiǎn)介】 ght+完成式”表示“過去可能，本來可以于某事而實(shí)際上沒有干”，might的可能性較小，語氣較弱。 如：He may have finished reading the book. She might have given you some help，however bus she was.【情態(tài)動(dòng)詞易混點(diǎn)歸納】易混點(diǎn)一: can和be able to:兩者表示能力時(shí)用法相同，但can只有原形“can”和過去式“could”兩種形式，在其他時(shí)態(tài)中 要用be able to 來表示。另外 be able to 常常指經(jīng)過努力，花費(fèi)了時(shí)間和勞力之后才能做到某事。如：Jim can’t speak 。He could speak English at 5. 他五歲時(shí) 就會(huì)說英語。We’ll be able to see him next 。He has been able to drive. 他已經(jīng)會(huì)開車了。I’m sure you’ll be able to finish it 。We were able to reach the top of the mountain at 。易混點(diǎn)二:can和may1. can 和 may 均可用來征求意見或許可，意為“可以”， 一般可互換使用。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。 如：She may be in the classroom . 她可能在教室里。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。易混點(diǎn)三: may be 和maybe　　 用法區(qū)別 常用位置may be may為情態(tài)動(dòng)詞， be為動(dòng)詞原形 句中，作謂語maybe 副詞，大概、也許，相當(dāng)于perhaps 句首，作狀語例如：He may be wrong , but I’m not sure. 也許他錯(cuò)了，但我也不確定。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)。如：I can’t speak English . 我不會(huì)說英語。（2）不能。如：We can’t do it now because it’s too ，我們現(xiàn)在干不了。（3）否定句中表示推測(cè)。“不可能”，如：The man can’t be our teacher because he is much younger than our teacher.. 那個(gè)人不可能是咱們老師，他年輕得多。2. mustn’t 意為“ 禁止、不許”， 用來表達(dá)命令，表示強(qiáng)烈的語氣。 如：You mustn’t play football in the street. It’s too ，太危險(xiǎn)了?！　∫谆禳c(diǎn)五：must 和 have to 側(cè)重于個(gè)人意志和主觀上的必要。have to 側(cè)重于客觀上的必要，可用于現(xiàn)在時(shí)、過去時(shí)和將來時(shí)。如：I know I must study 。My brother was very ill, so I had to call the doctor in the ， 我只得半夜里把醫(yī)生請(qǐng)來。I haven’t got any money with me, so I’ll have to borrow some from my ，只好向朋友借點(diǎn)了。He said they must work 。2. have to可以用于多種時(shí)態(tài)；而must只用于一般現(xiàn)在或?qū)?。如：The position is due to hand in this morning, so I had to finish it last night. 作文今天早晨到期，因此我不得不昨天晚上完成。易混點(diǎn)六: used to do / be used to doing / be used to do…/ be used for doing sthused to do 表示過去常常發(fā)生的動(dòng)作， 強(qiáng)調(diào)過去，只用于過去，注意用 to do，不用doing形式；而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)語態(tài)形式。be used for doing sth“用作……” 如：My father used to eating ，但現(xiàn)在不得不早起了。She is used to eating 。He wasn’t used to eating in a 。A knife can be used for cutting things.(刀可以用來割東西)/ A knife can be used to cut things.(刀可以用來割東西)【情態(tài)動(dòng)詞例題解析】—________ you pass me a pen? I’d like to write down the phone number. —Sure. Here it is.A. Can B. Need C. Might D. Must【解析】 由題干可知，本句表示請(qǐng)求、許可。答案：A—May I go to the cinema, mum? — Certainly, but you ________ be back by 11 o’clock.A. can B. may C. must D. need 【解析】由題意可知， 此處并非表推測(cè)的用法， 而是媽媽對(duì)孩子提出的要求， 故選C, 意為“ 必須”。答案：C　You ______ get there by bus. A. don’t need B. needn’t to C. don’t need to D. need don’t to【解析】由選項(xiàng)A 可知 need 為實(shí)義動(dòng)詞， 故應(yīng)加上to 才正確。 選項(xiàng) B needn’t為情態(tài)動(dòng)詞， 應(yīng)去掉to，故選 C.You _______ worry about me. It’s nothing serious. A. can’t B. mustn’t C. needn’t D. won’t【解析】 由題干 It’s nothing serious 可推斷，第一句意為“你不必為我擔(dān)心”， 故選C。 本題易錯(cuò)選B, mustn’t 意為“禁止”，故不正確。答案：C—Excuse me. Is this the right way to the Summer Please? —Sorry, I’m not sure . But it _______ be.A. might ’t ’t 【解析】考查情態(tài)動(dòng)詞might 表推測(cè)的用法。 “I’m not sure” 說明說話者的語氣并不肯定， 所以要用 might。答案：AThe man in the office___be Mr. Black, because he went home just now.’t not ’t ’t【解析】 由下文 he went home just now 可知辦公室里那個(gè)人不可能是Mr. Black。mustn’t 意為“千萬別”，may not 意為“可能不”， needn’t意為“不必”。 can’t 意為不可能， 故選C?！狢an you go surfing with us this afternoon? —I’d like to , but I __ look after my sister at home , because my mother is ill. to 【解析】 由題干my mother is ill 為客觀要求可知， 選C.—May I take this book out of the reading room? —______. Please read it here.A. Certainly , you needn’t , you mustn’t , you may not【解析】May I…?的否定答語為 No, you can’t/ mustn’t.；Must I …?否定答語為 No，you needn’t/don’t have to.。Can I …?的否定答語為 No，you can’t. 在口語交際中，要體會(huì)句子中的情感差別。答案：C　　【情態(tài)動(dòng)詞活學(xué)巧練】1 ( )1 John___ e to see us tonight, but he isn39。t very sure yet. A. may B. can C. has to D. must( )2 They ___ do well in the exam. A. can be able to B. be able to C. can able to D. are able to( )3 —May I take this book out? —No, you___. A. can39。t B. may not C. needn39。t D. aren39。t ( )4 You___ go and see a doctor at once because you39。re got a fever.A. can B. must C. dare D. would ( )5 —Can you speak Japanese? —No, I____. A. mustn39。t B. can39。t C. needn39。t D. may not 2. ( )1. – He___ be in the classroom, I think