英语语法大攻克--情态动词
英语语法情态动词
情态动词也叫语气动词，表示说话人对所说动作的看法，认为它"可能"、"应当"、"必要"等。
情态动词不能单独作谓语动词，只能和动词原形一起构成谓语动词。
英语里的情态动词主要有：can (could), may (might), must, shall, will, would, need, dare, should, ought to。
情态动词在任何主语后没有人称和数的变化。
1. can 和could⑴表示能力Whales cannot live on land.A computer can't think for itself. 计算机不会独立思考。
He hurt his foot and couldn't play football.◆be able to 可用于多种时态，can和could只用于现在时和过去时。
He will be able to go with us this afternoon.I haven't been able to see the difference yet.◆如果表示"做到"，"设法干成了某事"，常用be able to …来表达（相当于managed to do sth. 或succeeded in doing sth. ）,而不用can /could。
With the firemen, they were able to escape from the burning house.We were able to get there before the meeting began.⑵表示可能性can表示可能性时，常用于疑问句和否定句中。
Can this be true? Can it be Mr. Black?He can't be at home. 他不可能在家。
英语语法讲义：情态动词
第四章情态动词（一）情态动词表示说话人对动作或状态的各种观点和态度，如需要、猜测、意愿或怀疑等。
情态动词有词义，但不完全，是所谓的“辅助性”动词，在句中不能单独充当谓语。
一、情态动词的特征和形式A. 情态动词的各种形式见下表：情态动词maymightcancouldmusthave toought towillwouldshallshouldneeddareused to否定式may notmight notcannot/can notcould notmust notdo not have toought not towill notwould notshall notshould notneed notdare notused not todid not use to简略否定式mayn't（老式英语，现在不常见）mightn'tcan'tcouldn'tmustn'tdon't have tooughtn't to （否定句中to可省略）won'twouldn'tshan't （只用于英国英语）shouldn'tneedn'tdaren'tusedn't todidn't use toB．情态动词除ought to, used to等外，后面只接不带to的不定式。
1．情态动词+doYou shouldn't be so careless. 你不该这样粗心大意。
Jessica told him yesterday she might not go on the trip.杰西卡昨天告诉他，她可能不去旅行了。
Difficulties can and must be overcome.困难能够而且必须克服。
2．情态动词+be doingShe must be listening to pop music.她肯定在听流行音乐。
英语语法大攻克--情态动词练习题
情态动词练习题( ) 1 John___ come to see us tonight, but he isn't very sure yet.A. mayB. canC. has toD. must( ) 2 They ___ do well in the exam.A. can be able toB. be able toC. can able toD. are able to( ) 3 -May I take this book out?-No, you___.A. can't B. may not C. needn't D. aren't( ) 4 You___ go and see a doctor at once because you're got a fever.A. canB. mustC. dareD. would( ) 5 -Can you speak Japanese?-No, I____.A. mustn't B. can't C. needn't D. may not( ) 1 -He___ be in the classroom, I think.-No, he ___ be in the classroom. I saw him go home a minute ago.A. can; may notB. must; may notC. may; can'tD. may; mustn't( ) 2 -Shall I get one more cake for you, Dad?-Thanks, but you___, I've had enough.A. may notB. must notC. can'tD. needn't( ) 3 Even the top students in our class can't work out this problem, so it be very difficult.A. mayB. mustC. canD. need( ) 4 He isn't at school. I think he ___ be ill.A. canB. shallC. mustD. has to( ) 5 ___ I take this one?A. MayB. WillC. AreD. Do( ) 1 The children___ play football on the road.A. can'tB. canC. mustn'tD. must( ) 2 You ___ be late for school again next time.A. mustn'tB. needn'tC. don't have toD. don't need to( ) 3 -Must I do my homework at once?-No, you___. A. needn't B. mustn't C. can't D. may not( ) 1 His arm is all right. He___ go and see the doctor.A. has not toB. don't have toC. haven't toD. doesn't have to ( ) 2 He had to give up the plan, ___ he?A. didB. didn'tC. doesD. doesn't( ) 3 They had to walk here, ___ they?A. mustn'tB. didC. didn'tD. hadn't( ) 1 He had better stay here, ___ he?A. didn'tB. don'tC. hadn'tD. isn't( ) 2 You'd better___late next time.A. not to beB. not beC. won't beD. don't be( ) 3 You'd better ___ your hair ___ once a month.A. had; cutB. had; cuttedC. have; cutD. have; cutted( ) 4 You___ ask that man over there. Maybe he knows the way.A. had better not toB. had not betterC. had betterD. had better not ( ) 1 -Shall we go and visit the History Museum next Sunday?A. Here you areB. Sorry, I can'tC. Yes, pleaseD. Let me try ( ) 2 -Why don't you ask Mike to go with us?-Thanks, ___.A. I will B. I won't C. lean D. I may( ) 3 -___ I take the newspaper away?-No, you mustn't. Y ou____read it only here.A. Must; canB. May; canC. Need; mustD. Must; must( ) 1 Excuse me. ___ you please pass me that cup?A. DoB. ShouldC. WouldD. Must( ) 2 ___ you like to have another try?A. CouldB. WillC. WouldD. Do( ) 3 -Would you like to go boating with us?-Yes, ___.A. I'd like B. I want C. I'd like to D. I do( ) 1 You___ worry about your son. He will get well soon.A. needn'tB. can'tC. mustn'tD. have to( ) 2 The poor man needs our help, ___ he?A. needB. needn'tC. doesD. doesn't( ) 3 -Must we do our homework first?-No, you___. You may have a rest first.A. mustn'tB. needn'tC. may notD. can't参考答案：1. 1-5 A D A B B2. 1-5 C D B C A3. 1-3 C A A4. 1-3 D B C5. 1-4 C B C C6. 1-3 B A B7. 1-3 C C C8. 1-3 A D B。
初中英语语法大全——情态动词
初中英语语法大全——情态动词情态动词用来表示说话人对某一个动作成状态的看法，态度，即说话人认为某事“可能、或许、应该“发生等。
情态动词和助动词一样不能单独作谓语，后面只他跟动词原形，没有人称和数的变化。
有些情态动词有过去式，但是它们并不完表示时间上的概念，有时只是表示某种语气。
常见的情态动词如下所示:used to ①过去习惯②习惯于can/could ①能力②可能③许可④推测had better 忠告may/might ①许可②推测③能力④祝愿⑤请求need 必要will/would ①将来②意愿③提议④习惯⑤推测ought to 义务shall/should ①意志②许可、命令③法律及规则④义务dare 敢于must ①责任、义务等②意志③推测④惊讶eg: He goes to hospital.他去医院看病了。
(表示一般事实)eg: He should go to hospital. 他应当去医院着病。
eg: He should not go to hospital. 他不应当去医院看病。
一、can/could的用法1.表示可能性(1) 表示说话者主观猜测的可能性时, can/could常用于否定句和疑问句中。
could 既可以表示过去的可能性，又可以表示现在的可能性，其语气更弱一些。
Who's the man over there? Is it Mr. Black? 那边那个男人是谁?是布莱克先生吗?--- It can't be him. He's much taller.不可能是他。
他更高一些。
(表示推测时用于否定句)eg: Could he still be alive after all this time? 过了这么长时间，他还可能活着吗? (表示推测时用于疑问句)(2)can用于肯定句中时表示理论上的可能性，即从理论上看有可但实际未必会发生。
有时指一时的情况，常意为“有时会”。
英语语法掌握情态动词
英语语法掌握情态动词情态动词是中国英语学习者的难点，情态动词误用也是中国英语学习者最常犯的四大错误之一。
不过，从现在开始，所有有缘看到这篇文章的朋友，从此将再没有情态动词使用上的烦恼。
小编在这里整理了相关知识，快来学习学习吧!英语语法掌握情态动词OP法是一种面向使用、面向功能的英语入门教程。
所有语言点的讲解、练习的设置都以真实使用为准则，以实现功能为导向。
这套教程结合了语料库语言学(corpus linguistics)、系统功能语法(systemic functional linguistics)、文体分析(genre analysis)和认知语言学(cognitive linguistics)的最新成果。
在对这些研究成果精心选择和编排的基础上，书先生和路夫人制作了这一套快速入门的教程。
本篇文章是OP教程的一小部分，目的是让朋友们一窥OP法在语言点解释上的威力。
在讲解中，我尽量避免使用专业术语，但熟悉语言学的朋友应该能看到系统功能语法和认知语言学的影响。
如果你看完这篇文章，对情态动词的用法能够恍然大悟，那你就应该相信OP法的也能够让你轻松学会英文其它语言点。
虽然创造这套教程用了我们好几年的功夫(仅仅是花在阅读各个领域经典著作的时间就是个惊人的数字，更不用说要从中抽取出适合学习者的内容并加以精心编排)，但如果能够让中国的英语学习者从此不再觉得英语是个难题，我们也算为中国的英语教育做出了贡献。
情态动词是干什么的?情态实际上是谓语动词的组成部分。
一个完整的谓语动词由三部分构成：情态+时态+语态，顺序也按此排列。
其中时态和语态是必须的(compulsory)，情态是可选的(optional)。
比如下句：It should have been finished long ago.在这个句子中，should是情态动词，have been表示动词为完成时态，而been done表明是被动语态。
请注意have been和been done的重合部分been，那是时态和语态的结合处。
英语语法大攻克--情态动词和系动词
2010中考英语真题分类汇编：单选情态动词和系动词(2010 .河北省卷,31. 1) -Do we have to finish our homework this afternoon? -Yes, you ________.A. mustB. canC. mayD. need【答案】A(2010湖南省娄底市5. 1) -Must I be in hospital for a week，Doctor? ?-No，you . You can go back home tomorrow.?A.mustn'tB.needn'tC. must?【答案】B(2010湖南省娄底市7. 1) -What do you think of the cake??-I like it very much. It tastes .?A.goodB.terribleC. well【答案】A(2010.江苏省盐城市3.1)The desk is not dirty.You_______clean it.A.mustn'tB.shouldn'tC.needn't C.can't【答案】C(2010.四川省内江市23. 1)-What is your mother going to do this Saturday?--I'm not sure.She_____go to see my grandmother.A.canB.mustC.may【答案】C(2010.四川省自贡市31. 1)-May we leave the classroom now?--No,you _________.You_________to leave until the bell rings.A.must;are allowedB.can't ,aren't supposedC.needn't ;aren't allowed【答案】C(2010山东省潍坊市20. 1)The cookies_______good .Could I have some more?A.tasteB.smellC.feelD.sound【答案】A(2010山东省潍坊市23. 1)-Is Jessica giving us a speech this evening?--No,it________be her.She________to Japan.A.mustn't ;has goneB.mustn't ;has beenC.can't ;has goneD.can't ;has been【答案】C(2010江苏省南京市6. 1)It's the library!So you________know shouting is not allo wed here.A.canB.mustC.needD.may【答案】B(2010.浙江省衢州市18. 1) - Shall we go for a picnic in the park this Saturday?- Oh, that _______ good.A. feelsB. looksC. tastesD. Sounds【答案】D(2010.浙江省衢州市24. 1) Boys and girls . don't forget your report . It ______ t oday .A. can't finishB. can't be finishedC. should finishD. should be finished【答案】D(2010.江苏省无锡市.8. 1)-Mr Smith must have been to your home this morning.--No,he______,because he didn't know my address.A.couldn'tB.can'tC.mustn'tD.may not【答案】A(2010.江苏省无锡市.9. 1)Though his grandmother lives ______,she never feels_ _______.A.alone;aloneB.lonely;lonelyC.alone;lonelyD.lonely;alone【答案】C(2010江苏省宿迁市9. 1)This piece of music _______ beautiful.A. looksB. soundsC. tastesD. smells【答案】B(2010年上海市36. 1)Is this a photo of your danguter?She looks _____in the pink dress!A.lovelyB.quietlyC.politelyD.happily【答案】A(2010年上海市45. 1)Everyone________go through the security check(安检)whe nenteri ng the World Expo Park.A.canB.mayC.mustD.ought【答案】C(2010·湖北省黄冈市，33，1)-Which T-shirt do you prefer?--The red one .It______more comfortable.A.tastesB.smellsC.feelsD.sounds【答案】C(2010.湖南长沙25. 1)-Must I finish my homework at school?--______.You can do it at home and hand it in next week.A.Yes,you mustB.No,you needn'tC.Yes,I can【答案】B(2010·江苏省扬州市，11，1)-Must I mop up the follr now?--No,you________.A.needn'tB.can'tC.shouldn'tD.mustn't【答案】A(2010四川省成都市33. 1)-The lake is said to be dry.Is that ture? --It _______.Look ,some kids are swimming in it.A.must be trueB.can't be trueC.may not be true【答案】B(2010·浙江省湖州市，19，1)-Is the man over there Mr. Brown? --It_____be him.He's much shorter.A.mustB.can'tC.needn'tD.may【答案】B(2010·山西省，26，1)______your American friend eat with chopsticks? -Yes, but he can't use them well.A. CanB.ShouldC. Must【答案】A(2010·湖北省武汉市，31，1)-Look at that girl! Is it Susan?--No, it _______ be her. She has gone back to her hometown.A. mustn'tB. can'tC. needn'tD. wouldn't【答案】B(2010·河南省，34，1)( )-It's such a long way! What shall I do?一You--take my car if you wantA willB mustC mayD shall【答案】C(2010·陕西省，26，1)-Must I finish my homework at school?--No,you_________.You can do it at home.A.can'tB.mustn'tC.needn'tD.won't【答案】C(2010·广西省梧州市，43，1)This is a secret between you and me.You_______tell it t o others.A.shouldB.mustn'tC.canD.may【答案】B(2010·山东省聊城市，28，1)-Dean,I hear you've got a set of Canadian stamps._______ _I have a look?--Of course .I'll fetch them for you.A.MayB.MustC.ShouldD.Need【答案】A(2010·湖北省十堰市，29，1)-Where's Jeff?--I'm not sure. He ______be playing football on the playground.A.needB.mightC.mustD.can【答案】B(2010·广西省梧州市，39，1)Song Zuying's voice is very sweet and her songs_____ver y beautiful.A.tasteB.soundC.smellD.feel【答案】B(2010·新疆省阜康市，25，1)( )-The winner of the race is a tall and thin boy with gl asses.--Then it_____be my friend,Mike,who looks like very fat.A.mightB.can'tC.don'tD.should【答案】B(2010·山东省莱芜市，30，1)--Listen! Is it Linda singing in the next room?--No, it __________ be her. She is still in Shanghai.A.can'tB.couldn'tC.may notD.might not【答案】A(2010·贵州省铜仁市，24，1)__This pair of shoes ____ belong to Jack. He likes this kind very much.- It ____ be his. It's too large for him.A. can; can'tB. may; needn'tC. must; mustn'tD. must; can't【答案】A(2010·福建省福州市，34，1)-Dad,must I do my homework now?--No.You________play games with your friends for a little while.A.wouldB.needn't D.may【答案】C(2010·湖北省黄石市，31，1) Teachers think students needn't do so much homework , but they _______ mal students do a lot in the past.A. have toB. mustC. had toD. Should【答案】C(2010·湖北省荆门市，29，1) You __▲ ____ smoke. You are only 14 and it isn't all owed.A. mustn'tB. don't have toC. needn'tD. won't【答案】A(2010·湖北省荆门市，30，1)The skirt is made of silk. It __▲ ____so soft, I like it.A. washesB. is washedC. is feltD. feels【答案】D(2010·湖北省襄樊市，34，1)- Can I go to the movie , Mum ?- Certaninly , But you ________ be back by ten o'clock .A. canB. mayC. mightD. must【答案】D(2010·黑龙江省鸡西市，34，1)( )―Can I take the magazines out?-No, sir. They ______ out of the reading-room. It's a rule.A. needn't be takenB. can't takeC. mustn't be taken【答案】C(2010·广西省定西市，22，1)( )--Who's that man? Is he Mr. Brown?--That be Mr. Brown. He never walks this way.A. can'tB. mustn'tC. mustD.can【答案】A(2010·广西省定西市，四，1)( )1.--Must I leave the room now?--No，you .A. needn'tB. can'tC. mustn'tD. couldn't【答案】A(2010·广西省桂林市，34，1)--- _____ I use your ruler, Lingling? --- Sure. Here you are.A. MayB. WouldC. NeedD. Must【答案】A(2010福建三明26. 1)-Whose jacket is it?--It_______be Wu Lei's .I saw him wear it just now.A.can'tB.mustC.may【答案】A(2010广西南宁33. 1)-Something ________terrible.What goes bad in the kitchen? --The meat.A.looksB.tastesC.smellsD.feels【答案】C(2010四川达州21.1) -Must I finish my homework right now?-No, you .A. needn'tB. may notC. mustn'tD. can't【答案】A(2010四川达州25. 1)This kind of paper soft.A. feelsB. tastesC. smellsD. sounds【答案】A(2010·天津市，44，1)-Can I wear any cothes I like to school?--No,you can't .You________wear a uniform.A.mightB.mustC.willD.would【答案】B(2010·青海省，宁夏，22，1)( ) ---Must I do the work today?---No, you _______. You may do it tomorrow.A. can'tB. mustn'tC. shouldn'tD. needn't【答案】D(2010·辽宁省沈阳市，9，1)Trees ____ fight air pollution.They are natural air conditio ners.A.shouldB.mustC.needD.can【答案】D(2010·江苏省镇江市，3，1)( )They _________ play football last Friday because Simon forgot to bring his football here.A. couldB. couldn'tC. can'tD. can【答案】B(2010·湖北省咸宁市，24，1) - Wow! You look different! You wear glasses.- Yes, I did. But now I am wearing contact lenses(隐形眼镜).A. couldB. mustC. used toD. would【答案】C(2010·江苏省连云港市，3，1)---__________ I have a ticket , please?---Sorry,sir. All the tickets were sold out ten minutes ago.A. MayB.NeedC.MustD.Should【答案】A(2010·浙江省杭州市，22，1)I'm feeling much better now so you ______ call the doct or.A. couldn'tB. wouldn'tC. can'tD. needn't【答案】D(2010·甘肃省兰州市，38，1)-May we leave the classroom now?-No, you ______. You ______ to leave until the bell rings.A. mustn't, are allowedB. don't have to, are supposedC. needn't, aren't allowedD. can't, aren't supposed【答案】D(2010·四川省眉山市，32，1)-- Can I tell Peter about the news?-- No, I don't want anyone else to know it. You keep it to yourself.A. mustB. needC. canD. may【答案】A(2010·四川省巴中市，42，1)You______be tired after playing sports for a long time wi thout a rest.A.mustB.needC.can't【答案】A(2010·江苏省苏州市，12，1)-I don't care what my teachers think.-Well，you________.A.couldB.wouldC.shouldD.might【答案】C(2010·浙江省东阳市，18，1)( ) 18. -Whose shirt is this?--It _______ be Li Lei's. It is too big for him.A. couldB. mustC. can'tD. might【答案】C(2010·台湾省，2，1)I put the fish in the ice box to keep it .(A) fresh (B) full (C) new (D) young【答案】A(2010·广东省，22，1)It doesn't look like rain, so you bring your umbrella with you.A. shouldn'tB. mustn'tC. can'tD. needn't【答案】D。
2022高考英语语法金点拨-情态动词
2022高考英语语法金点拨-情态动词一．情态动词的语法特点1）情态动词除ought 和have 外，后面只能接不带to 的不定式。
2）情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。
二．情态动词的用法（Can/could、May/ might、Must、Shall/should、will/would、Dare、Need、ought to）（一）. Can1.差不多用法1）表示能力The parrot can speak three languages.2）表示要求/承诺Can/Could I borrow the book from the library.Yes.I can/No.I can’t。
(Could 不表过去式；只表语气更委婉，表要求只用于疑问句)3）表示可能性Shanghai can be very cold in March.2. Can 与be able to1）can could 表示能力；可能(过去时用could)2）表示过去成功地做了某事时，只能用was/were able to，不能用could。
He was able to flee Europe before the war broke out.= He managed to flee Europe before the war broke out.3）在否定结构中，二者能够互换。
3. can/could + have +p.p1）在否定、疑问句中表示“对过去发生行为的可能性推测。
The door was lacked. She couldn’t have been at home.2）在确信句中表示“本来能够做而未做” You could have been more careful.4.习语：cannot / can’t（never/hardly）do…too …“越……越好，如何也只是分”。
You cannot be too careful when you drive a car.驾车时候，越小心越好。
情态动词知识点
情态动词知识点情态动词（Modal Verbs）是英语中的一类特殊动词，用于表示说话人的态度、观点、意愿、能力、推测等。
了解和正确使用情态动词对学习英语语法和提高语言表达能力非常重要。
本文将介绍情态动词的基本知识点，包括定义、用法及常见情态动词的具体用法和表示的含义。
一、情态动词的定义和用法情态动词是一类特殊的助动词，常用的情态动词有can、could、may、might、must、shall、should、will、would等。
情态动词有以下几个特点：1. 情态动词本身没有词义，不能单独用作谓语，后面需加动词原形来构成句子。
2. 情态动词本身没有人称和数的变化。
3. 情态动词没有时态的变化，表示的是一种情态或态度，并不表示动作的时间或进行的状态。
情态动词主要用于以下几个方面的功能：1. 表示能力和可能性：can、could、may、might、must；2. 表示推测和可能性：may、might、could；3. 表示意愿和请求：will、would、shall、should；4. 表示命令和建议：shall、should、will、would；5. 表示义务和必要性：must、should。
二、常见情态动词的具体用法和含义1. can/could:- 表示能力、技能：I can speak English fluently.- 表示允许：Can I use your computer?- 表示请求：Could you please help me carry this bag?- 表示推测：He could be at home.2. may/might:- 表示允许、请求、建议：May I come in? Might I suggest a different approach?- 表示推测、可能性：She may be busy. It might rain later.- 用于虚拟语气：If I had more time, I might go on vacation.3. must:- 表示必须、肯定：You must follow the rules.- 表示推测、非常有可能：He must be tired.- 表示责任、命令：You must finish the report by tomorrow.4. shall/should:- 表示建议、意愿、命令：Shall we go for a walk? You should see a doctor.- 表示期望、推测：The train should arrive soon.5. will/would:- 表示意愿、决心：I will help you with the project.- 表示请求、邀请：Would you like to join us for dinner?- 表示推测、意愿、假设：She would probably be upset if you didn't go.三、注意事项1. 情态动词后面的动词原形不带to。
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情态动词一.情态动词的定义：情态动词表示说话人对某一动作或状态的态度。
二.情态动词的特点： 1.有一定词义； 2.不受主语人称和数的变化影响；3.与主要动词的原形（或称不带to的不定式）一起构成谓语（除ought to，have to作固定词组看待）。
三.情态动词的基本用法一、考查can的用法a.考查can表示能力的用法。
在这一用法中,can表示能力,意思是"能,会",其否定式can't表示"不能"。
在过去时中用could 和couldn't。
例如:1.-Where's Mr Lee? I have something unusual to tell him.-You________find him. He________Japan.A. may not; has gone toB. may not; has been toC. can't; has gone toD. can't; has been to2.-Finish drawing a horse in ten minutes. OK?-Sorry. It________in such a short time.A. may doB. can't be doneC. must doD. needn't be done3. I have my own room in my house, so I________do what I want in it.A. mustB. have toC. need toD. can4.________you mend my car? I______not start it.A. Would; wouldB. Must; mustC. Can; canD. May; may5.________she ride when she was three years old?A. CanB. CouldC. NeedD. May6. The boy________answer this kind of hard questions one year ago.A. canB. mayC. could注意：can 和be able to1.情态动词can只有两种时态形式，现在式can和过去式could，而be able to有多种时态形式。
Mary can play the piano. She has been able to play it since she was 5.玛丽会弹钢琴。
她五岁起就会弹了。
2.用在过去时中，could经常表示能够做某事，事实上不一定去做，而was∕were ableto则表示“过去做成了某事”。
在否定句中两者可通用。
He couldm across the English Channel. But he didn't feel like it that day.他能游过英吉利海峡，但那天他不想游。
Yesterday I was able to get home before the heavy rain昨天我在下大雨前赶到了家里。
b.考查can表示推测的用法。
在这一用法中,can意为"可能",表示客观可能性,常常用于疑问句和否定句中。
例如:7. Who is the man over there? Is it Mr Li? -No, it________be him. Mr Li is muchtaller.A. mustn'tB. may notC. can't D . needn't8. -Listen! Someone is singing in the next room. Who________it be? Is it Wei Fang?-No. It________be her. She is at school now.A. will; may notB. must; mustn'tC. may; can'tD. may; won't9. -Is Mr Hu in the reading room? -No, he________be there. He has gone toTianjin.A. mustn'tB. needn'tC. won'tD. can't10. Class 3 won the football match! ________it be true?A. MayB. MustC. WillD. Canc.考查can / could表示请求许可的用法?在这一用法中,can和could都表示现在,用could比用can语气更加委婉客气,常用CouldI / you...?句式,表示"我/你能……吗?"若表示同意要用can,不用could?例如:11.-Could I look at your pictures? -Yes, of course you________.A. couldB. canC. willD. might12.________you pass me a pen? I'd like to write down the telephone number.A. NeedB. CouldC. MustD. Should二、考查must的用法a.考查must表示义务的用法。
在这一用法中,must意为"必须","应该",表示必须要做的事,其否定式mustn't表示禁止,即不许对方做某事?例如:13.-May I go to the cinema, Mum? -Certainly. But you________be back by 11 o'clock.A. canB. mayC. mustD. need14.-SARS is such a terrible disease. -Yes, it is. We________be more careful.A. canB. mayC. mustD. need15. To make our city more beautiful, rubbish________into the river.A. needn't be thrownB. mustn't be thrownC. can't throwD. may not throw16. These books________out of the reading room. You have to read them here.A. can't takeB. must be takenC. can takeD. mustn't be taken17. Cars, buses and bikes________stop when traffic lights change to red.A. canB. mayC. mustD. need要注意must和have to的用法区别?must表示说话人的主观看法,而have to表示客观的需要,意思是"不得不"?例如:18. -Can you go swimming with us this afternoon?-Sorry, I can't. I________take care of my little sister at home because my mother is ill.A. canB. mayC. wouldD. have to句式变化区别：回答must开头的一般疑问句,如果是否定的回答,要用needn't或don't have to,表示"不必","没有必要"的意思,不用mustn't,因为mustn't表示禁止或不许,意思是"一定不要"的意思。
例如:19. -Must I finish the work before five o'clock? -No, you________.A. needn'tB. mustn'tC. have to20. -________I come back before five o'clock?-No, you________. But you________be back later than seven o'clock.A. Need; must; mustn'tB. May; mustn't; can'tC. Can; can't; can'tD. Must; needn't; can't21. -Must I clean the room right now?-No, you________. You________clean it after lunch.A. needn't; canB. needn't; mayC. mustn't; canD. mustn't; mayb.考查must表示推测的用法。
在这一用法中,must意为"一定","肯定",表示可能性很大,通常用于肯定句,在否定句中要用can't,表示"不可能"。
例如:22. Susan's parents have bought a large house with a swimming pool. It ____be very expensive.A. mustB. canC. mustn'tD. can't23. This book________Lucy's. Look! Her name is on the book cover.A. must beB. may beC. can't beD. mustn't be三、考查may的用法a.考查may表示请求许可的用法在这一用法中,may表示许可或征询对方许可,表示"可以"的意思,常常与第一人称I连用,构成May I...?句式,表示"我可以……吗?"肯定回答用Yes, you may.; Yes, please.等;否定回答用No, you can't.或No, you mustn't.,不用No, you may not.?例如:25. -________I have your name, please? -Yes, Michael. M-I-C-H-A-E-L.A. MustB. WillC. MayD. Need26. -May I go to the cinema, dad? -No, you________. You must finish your homework first. A. mustn't B. won't C. don't D. needn't27. -May I smoke here? -________, you________. It can be dangerous.A. Yes; canB. No; can'tC. Yes; mayD. No, needn'tAnswers: 25. C 26. A 27. B②测试may表示可能性的用法。