初中英语情态动词课件

(完整)初中英语情态动词练习题及答案

( )1 John___ come to see us tonight, but he isn'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. 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. can B. must C. dare D. 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 not B. must; may not C. may; can't D. may; mustn't 2 —Shall I get one more cake for you, Dad? —Thanks, but you___, I've had enough. A. may not B. must not C. can't D. needn't 3 Even the top students in our class can't work out this problem, so it be very difficult. A. may B. must C. can D. need 4 He isn't at school. I think he ___ be ill. A. can B. shall C. must D. has to 5 ___ I take this one? A. May B. Will C. Are D. Do 1 The children___ play football on the road. A. can't B. can C. mustn't D. must 2 You ___ be late for school again next time. A. mustn't B. needn't C. don't have to D. 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 to B. don't have to C. haven't to D. doesn't have to 2 He had to give up the plan, ___ he? A. did B. didn't C. does D. doesn't 3 They had to walk here, ___ they? A. mustn't B. did C. didn't D. hadn't 1 He had better stay here, ___ he? A. doesn't B. don't C. hadn't D. isn't 2 You'd better___late next time. A. not to be B. not be C. won't be D. don't be 3 You'd better ___ your hair ___ once a month. A. had; cut B. had; cutted C. have; cut D. have; cutted 4 You___ ask that man over there. Maybe he knows the way. A. had better not to B. had not better C. had better D. had better not 1 —Shall we go and visit the History Museum next Sunday? —________ A. Here you are B. Sorry, I can't C. Yes, please D. 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. You____read it only here. A. Must; can B. May; can C. Need; must D. Must; must 1 Excuse me. ___ you please pass me that cup? A.Do B. Should C. Would D. Must 2 ___ you like to have another try? A. Could B. Will C. Would D. 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't B. can't C. mustn't D. have to 2 The poor man needs our help, ___ he? A. need B. needn't C. does D. doesn't 3 —Must we do our homework first? —No, you___. You may have a rest first. A. mustn't B. needn't C. may not D. can't 1. I told Sally how to get here, but perhaps I _______ for her. A. had to write it out B. must have written it out C. should have written it out D. ought to write it out 2. —There were already five people in the car but they managed to take me as well. —It _______ a comfortable journey. A. can’t be B. shouldn’t be C. mustn’t have been D. couldn’t have been 3. It’s nearly seven o’clock. Jack _______ be here at any moment. A. must B. Need C. should D. can 4. Johnny, you _______ play with the knife, you _______ hurt yourself.

初中英语情态动词详细用法归纳(含练习及答案)(直接打印版)

初中英语情态动词详细用法归纳（含练习及答案）（直接打印版）情态动词有具体的词义，但也同助动词一样，需要与其他词语一起构成句子的谓语，另外情态动词没有人称和数的变化，情态动词后必须跟动词原形。 1. can 的用法：（1）.表示能力、许可、可能性。表示能力时一般译为―能、会‖，即有种能力，尤其是生来具备的能力，此时may 和must 均不可代替它。如：She can swim fast, but I can’t . 她能游得很快，但我不能。I can see with my eyes. 我用眼睛看。（2）.表示许可，常在口语中。如：You can use my dictionary. 你可以用我的字典。（3）.表示推测，意为―可能‖，常用于否定句和疑问句中，此时can’t 译为― 不可能‖。如：Can the news be true? 这个消息会是真的吗？—Can it be our teacher?那个人有可能是我们老师吗？—No, it can’t be our teacher. He is on a visit to the Great Wall.不可能。咱们老师正在游览长城呢。【例题】—I think Miss Gao must be in the library. She said she would go there. —No. She __be there, I have just been there. A.can’t B.mustn’t C.needn’t D.wouldn’t 【解析】根据下文―我刚去过那儿‖可知，应为― 不可能‖，can’t 表示推测[答案] A 2. could的用法：（1）.can的过去式，意为― 能、会‖，表示过去的能力。如：He could write poems when he was 10. 他十岁时就会写诗。（2）. could在疑问句中，表示委婉的语气，此时could 没有过去式的意思。如:Could you do me a favour? 你能帮我个忙吗？—Could I use your pen? 我能用一下你的钢笔吗? —Yes, you can.可以。（注意回答） 3. may的用法：（1）.表示请求、许可，比can 正式，如：May I borrow your bike? 我可以借你的自行车吗？You may go home now. 现在你可以回家了。【例题】—_______ I borrow your MP3? —Sure . Here you are. A. May B.Should C.Must D. Would 【解析】在此处表示请求，意为― 做……可以吗‖。答案：A (2) .表示推测，谈论可能性，意为― 可能，或许‖，一般用于肯定句中。如：It may rain tomorrow . 明天可能会下雨。She may be at home. 她可能在家呢. (3) .may的过去式为might ，表示推测时。可能性低于may。如：He is away from school. He might be sick. 他离开学校了，可能是他生病了。 (4) . 表示希望、祈求、祝愿，常可译为“祝愿”。通常是用may +主+V 例如：May you have a good time. 祝你过得愉快。May you be happy! 祝你幸福！May you succeed！祝你成功！ 4. must的用法： (1).must 表示主观看法，意为―必须、一定‖。如：You must stay here until I come back.在我回来之前你必须呆在这儿。Must I hand in my homework right now? 我必须现在交作业吗？ (2) 其否定形式mustn’t表示― 一定不要‖ ―千万别‖ ―禁止, 不许‖. 如：You mustn’t play with fire. 你不许玩火。You mustn’t be late. 你一定不要迟到。（3）对must引导的疑问句，肯定回答为must，否定回答为needn’t 或don’t have to .如：—Must I finish my homework?我现在必须完成作业吗？—No, you needn’t.不，你不必。 (4)must表示有把握的推测，用于肯定句。如: The light is on, so he must be at home now.灯亮着，他现在肯定在家。注意其反意问句的构成形式：当must表示肯定的判断、推测时，其反意疑问句要用实际问句的助动词来构成。如：She must have seen the film before，hasn’t she?(注意反意疑问句的后半部分)You must have met uncle Wang in the shop yesterday，didn’t you? (注意反意疑问句的后半部分)

初中英语情态动词讲解

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. 情态动词有一定的词义。 2. 情态动词不能单独做谓语，它必须和其他动词的原形一起构成谓语。 3. 情态动词没有人称，数的变化。（三）情态动词的结构和意义 1.情态动词的基本句型 ?肯定句：主语+情态动词+动词原形+...... ?否定句：主语+情态动词+not+动词原形+...... ?疑问句：情态动词+主语+动词原形+...... 2. 情态动词的意义 must“必须”；can/could“能，会”；may/might “可以”；should“应该”； would“愿，要”；have to“不得不”；need“需要” （四）情态动词的基本用法 1.can (could主要指过去时间) 1）表示人或物本身所具有的能力，意为“能，能够，会” : Two eyes can see more than one. / I can swim very well. 2）表示可能（理论上或是逻辑判断上） He can’t (couldn’t) have enough money for a new car. 3）表示允许： Can I have a look at your new pen? He asked whether he could take the book out of the reading-room. 4）表示对现在动作或状态的猜测，主要用于否定句和疑问句中或感叹句中: He can’t (couldn’t) be over sixty.他不可能超过六十岁。 5）could表示比can更委婉客气的提出问题或陈述看法，指的是现在时间。 Can (Could) you lend me a hand? 帮我一把好吗？ 2. may (might) 1）表允许，询问或说明一件事可不可以做，might指过去时间；但在疑问句中might也可指现在时间，语气比may更委婉。 May (Might) I ask for a photo of your baby? 我可以要一张你宝宝的照片吗？在回答以may引起的问句时，肯定回答是一般可仍用may,或Yes, please. / Certainly./Sure./Of course. ；否定回答根据说话人的语气由强到弱分别选用: must not(mustn’t)（禁止）/ had better not（最好别）/ may not（不行） 2) may表可能,但所表示的可能性不如can所表示的那样肯定。might可以指过去时间，也可以指现在时间，但语气更加不肯定。 He may be at home. 他可能在家。 They might be having a meeting, but I’m not sure.他们有可能在开会，不过我不肯定。 3. must（have to表示客观需要） 1）表示“必须”（主观看法）时，用于肯定句或疑问句；用于否定句时表示“禁止”。 We must do everything step by step. 我们一切都必须循序渐进地做。 You must get home before 9:00. 2）表示揣测。意为“想必、准是、一定”等，只用于肯定句。 He must be ill. He looks so pale. 他准是病了。他的脸色苍白。 3)must的疑问句，肯定回答用must，否定回答用needn’t或don’t have to。 4. should 1）表责任或义务，意为“应该”，用于各种人称。

中考英语情态动词用法总结

情态动词（一）情态动词概说 1．情态动词也是“辅助性”动词，用来表示说话人的语气或情态。情态动词所表示的情态有：请求、命令、允诺、可能、需要、敢于、愿望、义务、能力等。 2．情态动词本身有词义，但不能单独用作谓语，必须与动词一起构成谓语。没有人称和数的变化。如： 3．有些情态动词的过去时与其原形相同，有些与原形不同。 (1) 与原形相同的有： must --- must (2) 与原形不同的有： can --- could will --- would may --- might shall --- should need --- needed have to --- had to （二）情态动词的种类：（见下表）情态动词的否定式为：情态动词+not （三）常用情态动词的用法： 1．can与could （1）表示体力或脑力方面的“能力”，也能表示根据客观条件能做某事的“能力”。当表示将来的能力时，一般用will be able to；当表示过去的能力时，一般用could。 Can you jump as far as he did I can’t catch up with Jim. I couldn’t speak well until I was five years. can与be able to二者都表示“能够”，区别是：can只有现在时和过去式，而be able to 可用于各种时态。如： I’ll be able to speak French in half a year. He hasn’t been able to finish it on time. （2）表示允许。 ①could比can更委婉，表示客气地请求或委婉地陈述意见，这种用法多用于陈述句和疑问句中。 You can go now. Could you go skating with me tomorrow

初中英语情态动词用法归纳

初中英语情态动词用法归纳话题：动词情态教育学习情态动词有具体的词义，但也同助动词一样，需要与其他词语一起构成句子的谓语，另外情态动词没有人称和数的变化，情态动词后必须跟动词原形。考点一：can，may，must 等情态动词在陈述句中的用法：1. can的用法：（1）.表示能力、许可、可能性。表示能力时一般译为“能、会”，即有种能力，尤其是生来具备的能力，此时may和must均不可代替它。如：She can swim fast, but I can’t .她能游得很快，但我不能。I can see with my eyes.我用眼睛看。（2）.表示许可，常在口语中。如：You can use my dictionary.你可以用我的字典。（3）.表示推测，意为“可能”，常用于否定句和疑问句中，此时can’t译为“不可能”。如：Can the news be true?这个消息会是真的吗？—Can it be our teacher?那个人有可能是我们老师吗？—No, it can’t be our teacher. He is on a visit to the Great Wall.不可能。咱们老师正在游览长城呢。【例题】—I think Miss Gao must be in the library. She said she would go there.—No. She __be there, I have just been there. A.can’t

B.mustn’t C.needn’t D.wouldn’t【解析】根据下文“我刚去过那儿”可知，应为“不可能”，can’t表示推测[答案] A2. could 的用法：（1）.can的过去式，意为“能、会”，表示过去的能力。如：He could write poems when he was 10.他十岁时就会写诗。（2）. could在疑问句中，表示委婉的语气，此时could 没有过去式的意思。如:Could you do me a favour?你能帮我个忙吗？—Could I use your pen?我能用一下你的钢笔吗?—Yes, you can.可以。（注意回答）3. may的用法：（1）.表示请求、许可，比can正式，如：May I borrow your bike?我可以借你的自行车吗？You may go home now.现在你可以回家了。【例题】—_______ I borrow your MP3?—Sure . Here you are.A. May B.Should C.Must D. Would【解析】在此处表示请求，意为“做……可以吗”。答案：A(2) .表示推测，谈论可能性，意为“可能，或许”，一般用于肯定句中。如：It may rain tomorrow .明天可能会下雨。She may be at home.她可能在家呢.(3) .may的过去式为might，表示推测时。可能性低于may。如：He is away from school. He might be sick.他离开学校了，可能是他生病了。(4) .表示希望、祈求、祝愿，常可译为“祝愿”。通常是用may +主+V例如：May you have a good time.祝你过得愉快。May you be happy!祝你幸福！May you succeed！祝你成功！4. must的用法：(1).must表示主观看法，意为“必须、一定”。如：You must stay here until I come back.

(完整word版)初中英语情态动词的基本用法讲解

初中英语情态动词的基本用法讲解 1.can (could) 1）表示能力，could主要指过去时间。 Two eyes can see more than one. 两只眼比一只眼看得清。 Could the girl read before she went to school? 这女孩上学前能识字吗？ 2）表示可能（理论上或是逻辑判断上）。 The temperature can fall to –60℃, that is 60℃below freezing. 气温可降至—60℃，也就是零下60℃。 He can’t (couldn’t) have enough money for a new car. 他不可能有足够的钱买新车。 You mustn't smoke while you're walking around in the wood. You could start a fire. 在林子里走时勿吸烟，那样可能会引起火灾。 3）表示允许。 Can I have a look at your new pen? 我可以看一看你的新钢笔吗？ He asked whether he could take the book out of the reading-room. 他问他可不可以把书带出阅览室。 4）表惊异、怀疑、不相信等态度。主要用于否定句、疑问句或感叹句中。 Where can (could) they have gone to? 他们会去哪儿了呢？ He can’t (couldn’t) be over sixty. 他不可能超过六十岁。 How can you be so careless? 你怎么这么粗心？ 5）比较委婉客气地提出问题或陈述看法。 Can (Could) you lend me a hand? 帮我一把好吗？ I’m afraid we couldn’t give you an answer today. 恐怕我们今天不能给你答复。 2.may (might) 1）表允许，might可以指过去时间，也可指现在时间，语气更委婉。 You may take whatever you like. 你喜欢什么就拿什么。 He told me that I might smoke in the room. 他告诉我可以在房间里抽烟。 May (Might) I ask for a photo of your baby? 我可以要一张你宝宝的照片吗？在回答以may引起的问句时，多避免用这个词，而用其它方式，如Yes, please. / Certainly. / Please don’t ./ You’d better not. / No, you mustn’t.等，以免显得太严峻或不客气。 2）表可能（事实上）。可以指过去时间，也可以指现在时间，但语气更加不肯定。 He may be at home. 他可能在家。 She may not know about it. 她可能不知道这件事。 He was afraid they might not agree with him. 他担心他们可能不同意他的意见。 They might be having a meeting, but I’m not sure. 他们有可能在开会，不过我不肯定。 3. must 1）表示义务。意为“必须”（主观意志）。 We must do everything step by step. 我们一切都必须循序渐进地做。 You mustn’t talk to her like that. 你不可能那样对她说话。 --Must we hand in our exercise—books now? 我们现在就要交练习本吗？ --No, you needn’t. / No, you don’t have to. 不必。（这种情况下，一般不用mustn’t）2）表示揣测。意为“想必、准是、一定”等，只用于肯定句。 He must be ill. He looks so pale. 他准是病了。他的脸色苍白。 She’s wearing a diamond necklace. She must have a lot of money. 她戴着钻石项链，一定

中考英语情态动词真题

中考英语情态动词真题精选 ??????情态动词是初中英语里的一个重要语法项目,也是全国各省市中考试题的一个考查热一、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.?(2003黑龙江) A.?may?not;?has?gone?to? B.?may?not;?has?been?to C.?can't;?has?gone?to? D.?can't;?has?been?to 2.-Finish?drawing?a?horse?in?ten?minutes.?OK -Sorry.?It________in?such?a?short?time.?(2003山东威海) A.?may?do? B.?can't?be?done C.?must?do? D.?needn't?be?done 3.?I?have?my?own?room?in?my?house,?so?I________do?what?I?want?in?it.?(2002江西) A.?must? B.?have?to? C.?need?to? D.?can 4.________you?mend?my?car?I______not?start?it.?(2002常德市) A.?Would;?would? B.?Must;?must? C.?Can;?can? D.?May;?may 5.________she?ride?when?she?was?three?years?old(?2002长沙市) A.?Can? B.?Could? C.?Need? D.?May 6.?The?boy________answer?this?kind?of?hard?questions?one?year?ago.(2002四川省)? A.?can? B.?may? C.?could 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?much?taller.?(2003河北)

初中英语情态动词用法归纳

初中英语情态动词用法归纳情态动词有具体的词义，但也同助动词一样，需要与其他词语一起构成句子的谓语，另外情态动词没有人称和数的变化，情态动词后必须跟动词原形。考点一：can，may，must 等情态动词在陈述句中的用法： 1. can 的用法： (1).表示能力、许可、可能性。表示能力时一般译为“能、会”，即有种能力，尤其是生来具备的能力，此时may和must均不可代替它。如：She can swim fast, but lean 她能游.得很快，但我不能。I can see with my eyes我用眼睛看。 (2).表示许可，常在口语中。如：You can use my dictionary. 你可以用我的字典。 (3).表示推测，意为可能”常用于否定句和疑问句中，此时can'译为不可能”女口：Can the news be true?这个消息会是真的吗？一Can it be our teacher那个人有可能是我们老师吗？一No, it can' t be our teacher. He is on a visit to the GreatlW不可能。咱们老师正在游览长城呢。【例题】一I think Miss Gao must be in the library. She said she would go ther—No. She __be there, I have just been there. A.can ' t B.mustn ' t C.needn ' t D.wouldn 't 【解析】根据下文我刚去过那儿”可知，应为不可能” can'表示推测［答案］A 2. could 的用法： (1).can的过去式，意为能、会”表示过去的能力。女口：He could write poems when he was 10. 他十岁时就会写诗。 (2). could在疑问句中，表示委婉的语气，此时could没有过去式的意思。如:Could you do me a favour?你能帮我个忙吗？一Could I use your pen?我能用一下你的钢笔吗？一Yes, you can可以。(注意回答) 3. may 的用法： (1) .表示请求、许可，比can正式，如：May I borrow your bike?我可以借你的自行车吗？You may go home now现在你可以回家了。【例题】一______ I borrow your MP3?- Sure . Here you are. A. May B.Should C.Must D. Would 【解析】在此处表示请求，意为做……可以吗”答案：A (2) .表示推测，谈论可能性，意为“可能，或许”，一般用于肯定句中。如：It may rain tomorrow .

初中英语语法讲解情态动词

情态动词的用法【真题再现】 1. —I know by what time you want the project to be done? (2014 连云港) — By the day after tomorrow. you finish it on time? A. May; Can B. Must; Need C. Could; Must D. Need; Would 2. I follow you. Would you please repeat it? (2014 河北) A. can't B. mustn't C. needn't D. shouldn't 3. — Who's singing in the garden? (2014 长沙) — It be Mr. Brown. He always practices singing at this time. A. must B. can't C. need 4. —May I take this magazine out of the reading room? (2014 苏州) —No, you _________. You read it in here. A. mightn't B. won't C. needn't D. mustn't 5. You _________ touch an electric fire. It's dangerous. (2014 沈阳) A. need B. must C. needn't D. mustn't 6. —_________ you come with me to Lang Lang's piano concert this evening? (2014 广东) — I'd love to, but I have to study for my math test. A. Should B. May C. Must D. Can 7. Children _________ sit in the front seat of a car. It's too dangerous. (2014 重庆) A. need B. needn't C. must D. mustn't 8. — Look, someone left a book.(2014 菏泽) —Oh, yeah … This book _________ be Kitty’s. Only she likes to read this kind of books. A. can B. must C. may D. might 9. Look! The traffic light has turned red．We_________ stop our car．(2015 广东) A．can B．can’t C．must D．mustn’t 10. — Do you have any plans for this Sunday? (2015 安徽) —I’m not sure. I _________ go to the countryside to see my grandmother. A. can B. must C. may D. need 11. As middle school students, we _________ be afraid of difficulties if we want to make our dreams come true. (2015 哈尔滨) A．must B．shouldn’t C．need 12. You return the book now. You can keep it until next week if you like.(2015 青岛) A. have to B. can’t C. mustn’t D. needn’t 13．—Mom, must I go shopping with you? (2015 南京) —No, you ．You can watch the film Big Hero 6 with your friends． A．needn’t B．can’t C．shouldn’t D．mustn’t 14. Harry’s been driving all day—he be tired.(2015杭州) A. need B. can C. shall D. must 15. It’s surprising that Mr. Ma’s little daughter speak English so well. (2015 重庆) A. must B. can C. mustn’t D. can’t 【答案与解析】 1. A。句意：——我可以知道你想这个项目何时完成吗？——到后天。你能按时完成吗？may可以；can能够；must必须；could用于一般疑问句通常表示请求；need需要。题干问句是请求，可用may或者could，排除B、D两项；答句是询问能否按时完成任务，应选can。

初中英语情态动词专项练习题

情态动词情态动词是一种本身有一定的词义，但要与动词原形及其被动语态一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。情态动词后面加动词原形。情态动词有四类： ①只做情态动词：must,can(could),may(might)…… ②可做情态动词又可做实义动词：need，will ③具有情态动词特征：have(had,has) to,used to，ought to ④情态动词表猜测：一肯一否三不定（must一肯，can not一否，may，might，could，三不定。）注：mustn't代表强烈禁止 must表示主观，have to表示客观。常用的有：can may could must have use . 情态动词无人称和数的变化，情态动词后面跟的动词须用原形，否定式构成是在情态动词后面加 "not"。个别情态动词有现在式和过去式两种形式，过去式用来表达更加客气，委婉的语气，时态性不强，可用于过去，现在或将来。情态动词属非及物动词，故没有被动语态。情态动词表推测的用法小结（一）情态动词表推测的三种句式 1．在肯定句中一般用must （一定），can,could（可能），might /may（也许，或许）。 e.g:(1)He must/can/may,might know the answer to this question. 他一定/可能/也许知道这个问题的答案。 (2)It is cold in the room. They must have turned off the heating. 屋里很冷，他们肯定把暖气关了。 2．否定句中用can’t / couldn’t（不可能），may not/might not（可能不）。

(完整版)最新初中英语情态动词专项练习(含答案)

情态动词情态动词是一种本身有一定的词义，但要与动词原形及其被动语态一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。情态动词后面加动词原形。情态动词有四类： ①只做情态动词：must,can(could),may(might)…… ②可做情态动词又可做实义动词：need，will ③具有情态动词特征：have(had,has) to,used to，ought to ④情态动词表猜测：一肯一否三不定（must一肯，can not一否，may，might，could，三不定。）注：mustn't代表强烈禁止 must表示主观，have to表示客观。常用的有：can may could must have use . 情态动词无人称和数的变化，情态动词后面跟的动词须用原形，否定式构成是在情态动词后面加"not"。个别情态动词有现在式和过去式两种形式，过去式用来表达更加客气，委婉的语气，时态性不强，可用于过去，现在或将来。情态动词属非及物动词，故没有被动语态。情态动词表推测的用法小结（一）情态动词表推测的三种句式 1．在肯定句中一般用must （一定），can,could（可能），might /may（也许，或许）。 e.g:(1)He must/can/may,might know the answer to this question. 他一定/可能/也许知道这个问题的答案。 (2)It is cold in the room. They must have turned off the heating. 屋里很冷，他们肯定把暖气关了。 2．否定句中用can’t / couldn’t（不可能），may not/might not（可能不）。 e.g:(1)It can’t/couldn’t be the headmaster. He has gone to America. 这不可能是校长，他去美国了。 (2)He may not/might not know the scientist. 他也许不认识那位科学家。 3．疑问句中用can/could （能……?）。 e.g:(1)．Could he have finished the task?

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