情态动词专题
情态动词表示说话人的语气和态度。如需要、愿意和怀疑等。它们有一定的词义，但不完整，必须和主要动词的原形一起构成谓语，常用的情态动词有：can, could, may, might, must, have to, ought to, should, will, would, need, dare, shall, , be able to及半情态动词had better, would rather, have to, would like to.
情态动词的基本用法：
一、can
1. 表示能力“能……，会……”
A computer can?t think for itself; it must be told what to do.
2. 表示许可，“能够……，可以……”；在疑问句中表示请求许可“能不能……，要不要……，用could表委
婉语气，还可以用may。
You can go out to play when you finish your homework.
--Can /Could /May I go now ?—Yes, you can/may.
Could you give me a lift to the station?
3. 表示猜测，通常用在疑问句中，表示惊讶、怀疑；用于否定句中，表示有把握的否定推测“不可能……”
Who can it be ?那会是谁呢？Can it be true? 那会是真的吗？
She can?t be waiting for you. 她不可能在等你。
He can?t have gone there alone.他不可能独自一人到那儿去。
4.（表示平时大部分时间不是这样，只是偶然发生）“有时候会……”。
Some equipment at home can be dangerous to children.
Peter can be really hard to get along with even though he is a nice person in general.
特别记忆：
①can not/ can never…too…或cannot … enough“再……也过分，越……就越好”
You can never be too careful （you can?t be careful enough ）while crossing the street.
②can?t help doing sth.= can?t help but do sth = can?t but do sth =can do nothing but do sth.
When a close friend dies, you can?t but feel sad.
③were /was able to do sth. 表示过去设法成功地做了某事，could没有此意
The fire spread through the hotel very quickly, but everyone was able to get out.
④can?t/couldn?t have done 不可能做过…；could have done 本来能够做，（却没做成）
I could have worked out the problem，but I was too nervous.
--- A man answered the phone. I suppose it was her husband.
--- It couldn?t have been her husband. He had been dead for ages.
二、may
1.（表示许可、请求允许）可以……，might比may 的语气更委婉。否定回答常用mustn?t.
-- May/might I use your camera? No, you mustn?t / I am afraid you can?t.
-- Yes, you may.(Yes, please.) .
You may not take photographs in the museum.
2.may表示把握性不大的猜测，“或许，可能”，might可能性更小。may not 可能不…
I might see you again — who knows?
Things might not be so bad as they seem.
He may not come this afternoon, I am not sure.
3.（表示愿望、祝福）愿……，祝……。用倒装语序。
May you succeed! May you be happy! May you return in safety!
★may/ might have done.对过去动作不大有把握的推测，“也许已经…”
★might have done本来可能…，但实际上没有发生。
You shouldn?t have climbed the hill. You might have killed yourself.你本不该爬那山的，你或许会摔死的。
★may/might as well do…不妨……的好、还是……的好。
Since it?s a fine day, we might as well take a walk.
★may well do 很可能……,完全有理由……
He may well be proud of his son.
三、must
1.（表示义务、必要性、命令）必须，得，要。回答must的问句时，否定式用needn?t或don?t have to. “mustn?t”
表示禁止、不可以。
——Must I wash the dishes at once?
——Yes, you must./No, you needn?t.( No, you don?t have to.)
We mustn?t waste our time.
2. （表示固执、不满）偏偏，硬要，偏要
Why must you make such a big noise while your sister is sleeping?
★表示绝对的有把握的肯定推测，“一定”“准是”must be doing sth.一定正在做某事;
must have done对过去动作的推测；注意其后的反疑疑问句形式。
There must be a mistake, isn?t there ?
He must be watching TV at home, isn?t he?
He must have seen the play, hasn?t he?
You must have gone to the cinema last night, didn?t you?
★have to ( have got to) 强调客观需要，而且有人称、时态、数的变化。
You will have to wait until the manager comes back.
I had to work when I was your age.
四、shall
1. 用于疑问句中, 第一、第三人称，表示说话人征求对方的意见或向对方请示。
Shall we go out for a walk? 我们出去散步好吗？
Shall he come in or wait outside? =Do you want him to come in or wait outside? 要他进来还是在外面等候？2. 用于陈述句中，第二、第三人称，表示说话人的警告、强制、命令、要求、允诺或威胁。
You shall fail if you don?t work hard.（警告）
He shall get the book when I finish reading.(允诺)
3.（用于法律、规则等条文中）应……、须……、得……
No person shall smoke or carry a lighted cigarette, cigar in this area.
五、should
1. （表义务、责任）应该
You should apologize to him.
2.（表预期）应该会，想必会，一定会……吧
The photos should be ready by 12:00.
It?s almost seven o?clock now. They should be at home.
3.（表惊讶、遗憾）竟然、居然
I am surprised that a well-- dressed gentleman should speak so rudely.
It…s strange that Tom, the most excellent student in our grade should fail in the exam.
4. Why/How+ should+…? 结构表示说话人对某事不理解、感到意外、惊异等，意为“竟然”。
I don?t know why you should think that I did it.我真不知道你凭什么认为这件事是我干的。
5. 用于某些表示建议、命令、请求的动词（如insist, order, demand, advise, suggest, recommend, propose, require,
request, command, desire等）后的宾语从句中，谓语为（should ）+ v 。这类词的名词后的同位语从句、表语从句也用（should ）+ v
I suggested the meeting (should) be put off.
My suggestion is that the meeting( should) be put off.
It is suggested that the meeting (should) be put off.
★ought to / should have done过去本应该做却没有做某事含有责备之意; should have done也有惊讶之意“居
然……。
I told Sally how to get there, but I should have written it out for her.
I was surprised she should have won the first prize in the competition.
★oughtn?t to / shouldn?t have done过去本不该做却做了某事。
I was really anxious about you. You shouldn?t have left home without saying a word.
六、will 与would
1. 表示意志、愿望、决心、习惯、倾向性。
I will never do that again.
I will do the work if she will do it with me.
He will sit there for hours without doing anything.
Man will die without air and water.
2. 用于第二人称表示请求、建议等，would比will 委婉、客气。
Would you pass me the book? Won?t you come and sit for a while?
3. 临时做出的决定.
- -Do you know Jones is in hospital ?--Oh, I didn?t know. I will go to see her this afternoon.
4. 过去反复发生的动作或某种倾向用would。
During the vacation, he would visit me every week.
When I was young, I would sit under the old tree listening to grandpa tell me stories.
5. won?t /wouldn?t 表示主语不具有某种功能，“就是不肯……，不能……”
The machine won?t work. The car wouldn?t move , no matter how hard I pushed it.
七、dare与need
1. need表示“需要”、“必须”作情态动词时，仅用于否定句和疑问句中；在肯定句中作实意动词后接不定式。
Need I finish the work today?---Yes, you must /have to.
★needn’t have done意为“本来没必要做却做了”。
As it turned out to be a small house party，we needn’t have dressed up so formally.
2. dare 作情态动词主要用于疑问句、否定句和条件句中。用作实意动词时，在否定句中后边的to可以省略. He daren?t speak English before such a crowd, dare he?
He doesn?t dare (to) ask me questions.
★would like to do sth. 想做某事, would like/ love to have done 本来想做却没有做成
I would like to have come to your birthday yesterday, but I was busy preparing a report.
情态动词之高考题选：
1. —I left my handbag on the train，but luckily someone gave it to a railway official.
—How unbelievable to get it back! I mean，someone ________ it.
A. will have stolen
B. might have stolen
C. should have stolen
D. must have stolen
2. --Write to me when you get home.
--Yes, ____ .
A . I must B. I should C. I will D. I can
3. --Are you coming to Jeff?s party?
--I?m not sure, I ____ go to the concert instead.
A. must
B. would
C. should
D. might
4. --Will you stay for lunch?
--Sorry, ____ . My brother is coming to see me.
A. I mustn?t
B. I can?t
C. I needn?t
D. I won?t
5. --When can I come for the photos? I need them tomorrow afternoon.
--They ____ be ready by 12:00.
A. can
B. should
C. might
D. need
6. -- I stayed at a hotel while in New York .
--Oh, did you ? You ___ with Barbara.
A. could have stayed
B. could stay
C. would stay
D. must have stayed
7. The fire spread through the hotel very quickly but everyone ___ get out.
A. had to
B. would
C. could
D. was able to
8. Johnny , you ____ play with the knife, you ____ hurt yourself.
A. won?t, can?t
B. mustn?t , may
C. shouldn?t , must
D. can?t , shouldn?t
9. --Is John coming by train?
--He should , but he ___ not. He likes driving his car.
A. must
B. can
C. need
D. may
10. A left luggage office is a place where bags ____ be left for a short time especially at a railway station.
A. should
B. can
C. must
D. will
11.-- Isn?t that Ann?s husband over there?
--No, it ___ be him. I?m sure he doesn?t wear glasses.
A. can?t
B. must not
C. won?t
D. may not
12. —May I take this book out of the reading room?
—No，you ________.You read it in here.
A. mightn?t
B. won?t
C. needn?t
D. mustn?t
13. --- You needn?t take an umbrella. It isn?t going to rain. --- Well, I don?t know. It_____
A. might
B. need
C. would
D. should
14. He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.
A. wouldn?t
B. shouldn?t
C. couldn?t
D. mustn?t
15. When I was a child, I ______ watch TV whenever I wanted to.
A. should
B. could
C. must
D. need
16. Harry is feeling uncomfortable. He _____ too much at the party last night.
A. could drink
B. should drink
C. would have drunk
D. must have drunk
17. The children _____ lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.
A. must have got
B. must get
C. should have got
D. should get
18. —Why are your eyes so red? You _______ have slept well last night. —Yeah, I stayed up late writing a report.
A. can?t
B. mustn?t
C. needn?t
D. won?t
19. No one _____ be more generous; he has a heart of gold.
A. could
B. must
C. dare
D. need
20. Since nobody gave him any help, he _____ have done the research on his own.
A. can
B. must
C. would
D. need
21. The door ____ open , no matter how hard she pushed.
A. shouldn?t
B. couldn't
C. wouldn't
D. mightn't
22. I ________ myself more—it was a perfect day.
A. shouldn?t have enjoyed
B. needn?t have enjoyed
C. wouldn?t have enjoyed
D. couldn?t have enjoyed
23. It _____be the vocabulary that caused you the problem in the exercise because you know a lot of words.
A. may
B. couldn?t
C. should
D. needn?t
24. If we _____ a table earlier, we couldn?t be standing here in a queue.
A. have booked
B. booked
C. book
D. had booked
25. Eye doctors recomme nd that a child?s first eye exam ______ at the age of six months old.
A. was
B. be
C. were
D. is
一、选择题 1．It is 11:00 p.m now. Peter hasn't come back yet. His mother ______ be very mad at him. A．may B．can C．must D．need 2．—Have you heard about the temperature of the earth will rise to 59℃ in 2020?—Don’t worry! The news _______ be true. A．must not B．may not C．needn’t D．will not 3．-Listen! A wolf is crying! -It _______ be a wolf, because a wolf never comes out at this time. A．mustn’t B．needn’t C．can’t D．don’t 4．I’ve bought a nice necklace for Jo’s birthday. She _____like it, but I’m not sure. A．can B．may be C．might D．must 5．---Mum, must I finish my homework today? ---No, you . Tomorrow is Sunday and you may have a rest today. A．shouldn’t B．mustn’t C．can’t D．don’t have to 6．You look quite tired. You'd better ________ a good rest. A．stop to have B．stop having C．to stop to have D．to stop having 7．—Tom, we’re going shopping at eight, right? —Yeah, but I ______ be a little late, so don’t wait for me. A．may B．should C．mustn’t 8．You should________ the teacher________being late for school. A．apology to, about B．apologize to, for C．apologies to, for D．apologize to, on 9．—Can you come to my party on Saturday afternoon? —Sorry, I can’t. I ________ meet my friends. A．can’t B．might have to C．needn’t 10．— I wonder if these are Jim's glasses. —They _____his. He doesn't wear glasses. A．might be B．could be C．can't be 11．—The book report is very important. You ________ write it carefully. —But I ________ hand it in now. A．must; must B．have to; must C．must; have to D．have to; have to 12．Even the top student can't work out this problem, so it________ be too difficult. A．must B．may C．can D．need 13．—________ I borrow the books from the library, Miss Yang? —Sorry, you________. These books are only for members of the English Club. A．Can; couldn’t B．Could; can’t C．Could; could n’t D．Can; needn’t
情态动词表推测用法总结 （一）情态动词表推测 能用于表推测的情态动词： 英语情态动词表推测的时态构成 （1）语气部分：（以下情态动词语气由强至弱） 肯定句：must、may、might（=could） 否定句：can’t（=couldn’t）、mayn’t、mightn’t 疑问句：can、could（语气更加委婉不确定） （2）时态部分： 一般现在或一般将来时间的推测：情态动词+be；情态动词+v. 对过去时间的推测：情态动词+have done 对正在进行的时态的推测：情态动词+be doing （二）表许可、请求 1、 can, could 2、may, might 3、must 4、shall 5、will, would 1. can, could 1) 用在疑问句中，表示一般的请求。两者不同在于：用could 要比用can更加委婉，特别是没有把握得到允许时。 Can I go with you? 我能和你一起去吗？Could I ask you something? 我能问你一个问题吗？ 2) 用在陈述句中，表示许可：You can leave when you finish your work. 做完事情后你才可以走。 2. may, might 1) may用在疑问句中，也表示一般的请求。同can相比，may比较正式，常常表示尊敬之意。并且，may在疑问句中常用于第一人称，很少有May you…/they…这样的句型。Might比较少用在疑问句中，它表示请求的时候常用陈述句。 May I make a suggestion? 我可以提个建议？ 2) 用在陈述句中，表示许可，此时与can, could相近。 You may have a rest before we set out again. 我们再次出发之前你可以先休息一下。 3. must 1) 表示说话人“不许”和“禁止”某人做某事，有很强的劝告语气。 Cars must not be parked here.此地不准停车。 2) Must的一般疑问句的回答有两种，表示肯定，用Yes, you must. 表示否定，用No, you needn’t. Must I post this letter tomorrow? 我明天必须得寄掉这封信吗？ Yes, you must. 是的，你必须明天寄掉。
英语情态动词用法总结(完整) 一、单项选择情态动词 1．--- Difficulties always go with me! --- Cheer up! If God closes door in front of you, there be a window opened for you. A．must B．would C．could D．can 【答案】A 【解析】 【详解】 考查情态动词辨析。句意：——困难总是伴随着我！——高兴点! 如果上帝在你面前关上了门，一定有一扇窗户为你打开。A. must必须；B. would将要；C. could能，会；D. can能，会。must表示对现在的状态推测时，意为“一定”，表示可能性很大的推测。符合语境。故选A。 【点睛】 1) must用在肯定句中表示较有把握的推测，意为"一定"。 2) must表对现在的状态或现在正发生的事情的推测时， must 后面通常接系动词be 的原形或行为动词的进行式。 3) must 表示对已发生的事情的推测时，must 要接完成式。 4) must表示对过去某时正发生的事情的推测，must 后面要接完成进行式。 5) 否定推测用can't。 本句中的。must表示对现在的状态推测时，意为一定，表示可能性很大的推测。符合第2点用法。 2．Paul did a great job in the speech contest. He many times last week. A．need have practised B．might practise C．must have practised D．could practise 【答案】C 【解析】 【详解】 考查情态动词。句意：保罗在演讲比赛中表现得很好。他上星期一定练习了很多次。must have done是对过去发生的动作最有把握的猜测，意思是“一定”。故C选项正确。 3．He is a bad-tempered fellow, but he ________ be quite charming when he wishes. A．shall B．should C．can D．must 【答案】C 【解析】 【详解】 考查情态动词辨析。句意：他是个脾气不好的家伙，但当他希望自己有魅力的时候，他可
必修三unit2语法讲解情态动词用法（二） 、ought to的用法 1. ought to应该”与should相比较ought to语气重,偏重责任、义务、 道德、法律”等方面，意为应该” ①We ought to stop polluti ng n ature.我们应该停止污染大自然。 2. ought to表示较大的可能性。 ①Mary ought to be here soon.玛丽应该很快就来了。 ［点津］用ought to表示推断时，语气较肯定，通常指的是一种合乎逻辑的 可能性（与should表推断时相似）,有时可译为很可能；准是”语气比must要弱）。 3. ought to的否定形式为ought not to或ought n't to,其一般疑问句形式是将ought置于主语前。 ①We ought not to start so late.我们不该这么晚动身。 4. 在反意疑问句中,常省掉to用ought n't或should n't。 ① He ought to take back what he has said, ought n' t/should n't he? 他应该收回他说的话，是吗？ 1 —1.写出下面句中黑体部分的意义 ① To keep fit, weought to lear n more about our body. _____ ① Youought not to do such a thing. _______ ① Itought to be a close game. _______ 1 —2.用ought完成句子 ①（尔不该责备他。You __________ （scold ）him. ①我明天该动身吗？一_______________ （_leave ［tomorrow? 是的，你应该。一Yes, you ought to ①我们现在应该走，是吗？We ought to go now, ______________ _? 二、have to, don't have to 与must n't 的用法 1. have to（口语中常用have got to）表示客观需要做的事情，意为必须；不 得不”有时态、人称和数的变化，其否定式和疑问式应由助动词do构成。 ① My brother was very ill, so I had to call the doctor in the middle of the ni ght. 我弟弟病了，我不得不半夜里把医生请来。
最新英语语法情态动词归纳总结 一、单项选择情态动词 1．Mr. Smith is almost on time for everything. How ________ it be that he was late for the meeting? A．can B．should C．may D．must 【答案】A 【解析】 【详解】 考查情态动词辨析。句意：史密斯先生几乎任何事情都是准时的。他怎么可能开会迟到了？ A. can可能，可能性，表示可能性时，常用于否定句和疑问句中，且有时还带有“惊奇、不相信” 等感情色彩。B. should 应该； C. may也许，表示可能性时常用于肯定句中，不用于疑问句中。D.must常用于肯定句中表推测，“一定……”的意思；本题是强调句型的一个变式：强调其特殊疑问句how的形式。根据前句“斯密斯先生几乎是很准时”可推测出“怎么可能开会迟到呢？”。根据句意可知，用于疑问句中的“可能性”且有不相信的色彩，四个选项只有“can”符合题意。故选A 【点睛】 情态动词就是表示说话者对事情的一种看法，也就是一种语气。情态动词的用法一直是命题者常设置的考点和重点，平时要加强记忆。 2．--- Oh, my God! I just missed the last bus back home. --- That’s really bad. I’m sure you ______ it, but you just didn’t hurry up. A．had caught B．could have caught C．could catch D．can catch 【答案】B 【解析】 【详解】 考查情态动词+have done结构。句意：——哦,我的上帝!我刚好错过了回家的末班车。——这是非常糟糕的。我肯定你能赶上，但你就是不抓紧。could have done“本来能做而没有做”。故选B。 3．-- Did Jim come? -- I don’t know. He _______ while I was out. A．might have come B．might come C．must have come D．should have come 【答案】A 【解析】 【详解】 考查情态动词推测用法。句意：Jim来了吗？--我不知道，在我不在的时候，可能来过。根据前文I don’t kn ow.可知，说话者不知道Jim来没来，因此后文推测来过，但是语气很不确定，故可知选A。对过去情况的推测为情态动词+have done，must have done 一定做了某
情态动词表推测用法总结及专项练习 1.can / could用于表推测的用法 (1) 从使用句型上看，can 通常只用于否定句或疑问句，一般不用于肯定句，而could 可用于肯定句、否定句和疑问句。两者没有时间上的差别，只是could 比can 更委婉，更不确定。如：It can’t [couldn’t] be true. 那不可能是真的。 What can [could] they be doing? 他们会在干什么呢? We could go there this summer. 今年夏天我们可能要去那儿。 注：can 有时也用于肯定句中表示推测，主要用于表示理论上的可能性(即从理论上看是可能的，但实际未必会发生)，或表示“有时”之意。如： Even experienced teachers can make mistakes. 即使是有经验的教师也可能出错。 She can be very unpleasant. 她有时很令人讨厌。 (2) 从时间关系看，对现在或将来情况作推测，后接动词原形；对正在进行的情况作推测，后接be doing 结构；对过去情况作推测，后接动词完成式。如： He could have gone home. 他可能已经回家了。 He can’t [couldn’t] have understood. 他不可能理解了。
Why does he know this? Can [Could] someone have told him about it? 他怎么知道? 会是哪个人告诉他了吗? (3) “could+完成式”除表示对过去的推测外，还有以下重要用法： ①表示过去没有实现的可能性，常译为“本来可以”。如： I could have lent you the money．Why didn’t you ask me? 我本来可以借这笔钱给你的。你为什么不向我提出? ②用来委婉地责备某人过去应该做某事而没有去做，常译为“本来应该”。如： You could have helped him. 你本来应该帮助他的。 ③表示“差点儿就要”。如： I could have died laughing. 我差点儿笑死了。 2. may / might用于表推测的用法 表示推测，两者都可用，只是might 比may 语气更不确定，表示的可能性更小。 (1) 在句型使用方面：两者均可用于肯定句和否定句，但用于疑问句时，may通常不用于句首，但可用于疑问句的句中（如特殊疑问句等），而might尽管可以用于疑问句的句首，但不算普通，通常会改用其他句式（如用could等）。如： He may [might] know the answer. 他可能知道答案。
情态动词知识点总结 一、初中英语情态动词 1．Rock music ______ sound popular with the young, but it's not the favor of the aged people. A. must B. need C. should D. may 【答案】 D 【解析】【分析】句意：摇滚音乐在年轻人中听起来受欢迎，但是它不受上了年龄的人的 赞同。must, 表示猜测时，指把握比较大的肯定猜测，肯定……；need需要；should,应该；may，表示把握比较小的肯定猜测，可能，也许。结合句意，故选D。 【点评】考查情态动词辨析，注意几个常见情态动词的意思和用法。 2．——Shall we meet at the station at 7 am? ——In fact, we _______. The train _______ until 9 a. m. A. mustn't; doesn't leave B. mustn't; leaves C. needn't; won't leave D. needn't; will leave 【答案】 C 【解析】【分析】need，需要，否定式是needn't；must的含义是必须一定，其否定形式mustn't表示禁止的含义。句意：我们上午七点在车站见面好吗？——实际上，我们不必。 火车到上午九点钟才出发。结合语境可知后一空描述的是将要发生的动作，故用一般将来 时态。选C。 【点评】情态动词的考查是初中英语考查的重点，平时学习中一定要熟记这些词的基本词 义及用法上的不同，注意其用法及在句子中表达语气的不同。考试中结合语境选择合适答案。 3．We __________ pay to get into the concert. It's free. A. can't B. mustn't C. might not D. don't have to 【答案】 D 【解析】【分析】句意：我们进入音乐会不必付钱。这是免费的。A.can"t 不可能； B. mustn"t 禁止； C.might not 可能不；D. don"t have to不必。根据It's free.可知音乐会是免费的，因此不必付钱。故选D。 4．—Where is George? —He _______ be here just now. His coffee is still warm. A. need B. can't C. must D. shouldn't 【答案】 C 【解析】【分析】句意：——乔治在哪里？——他刚才一定在这里，他的咖啡还是热的。A.
Modal Verbs 情态动词有can (could), may (might), must (must), have to, shall (should), will (would), need (need), dare (dared), ought to 等。情态动词无人称和数的变化。它不能单独使用，必须跟其后的动词原形构成谓语。情态动词的具体用法如下： 一、can, could 1、表示能力。 a. Can you speak English? b. Can you finish this work tonight? c. Man cannot live without air. Note:
(1) can表示能力时，可用be able to 代替。 a. I’ll not be able to come this afternoon. (2) 当我们要表示“某件事情已经 成功”时，应用was/ were able to , 不能用could a. He saw well and he was able to swim to the river when the flood happened. b. He was able to go to the party yesterday evening and he enjoyed himself very much. 2、表示客观可能性
a. People who live near airports can have their hearing harmed. b. The boy can sometimes be very naughty. （表示某人或某物一时的情况，“有时会。。。”） c. The invention can be improve d. d. Even experts can make mistakes. e. He can’t be in Beijing now because I saw him a moment ago. f. He had a lot of work to do last night, so he couldn’t have gone to see a film. Note: 在肯定句中用can表示可能性时，其含义是理论上的可能性，不表示
专项：情态动词 一考点：情态动词的用法和辨析，情态动词表示推测和可能，由情态动词引导的一般疑问句的回答。 二类型：1 只是情态动词：can, could, may, might, must 2 可做情态动词，可做实义动词：need, dare 3 可做情态动词，可做助动词：will, would, shall, should 4 特殊：have to, ought to, used to 三特征：1 有一定的词义，但不能单独作谓语，必须与行为动词和系动词连用构成谓语。 2 无人称和数的变化。（have to 除外） Eg: He has to stay here. 3 后接动词原形。 4 具有助动词作用，可构成否定，疑问或简短回答。 四用法： 1. can ①表示能力，“能，会”。Eg : Can you play basketball? ②表示怀疑，猜测，常用于否定句或疑问句。 Eg :Li hua can’t be in the classroom. ③表示请求，允许，多用于口语，译“可以”= may. Eg: you can go now. ④can 开头的疑问句，肯定句，否定句用can或can’t. 2.could①can 的过去式，表示过去的能力。 Eg :I could swim when I was seven years old. ②could 开头的疑问句，肯定和否定回答用could, couldn’t如果could 表示现在的委婉，用can 回答。 Eg: Could I have a drink? Yes, you can. 3.may①表示推测，“可能，也许”，用于肯定句。 Eg: He may come tomorrow. ②表示请求，“许可,可以”。Eg: May I borrow your book? 注：表示请求，许可时，主语为第一人称的一般疑问句，否定回
英语情态动词的用法大全附解析 一、初中英语情态动词 1．—We've got everything ready for the picnic. —Do you mean I __________ bring anything with me? A. can't B. mustn't C. couldn't D. needn't 【答案】 D 【解析】【分析】句意：—我们已经为野餐准备好了一切。—你的意思是我不必带任何东西吗？A. can't 不能；B. mustn't 表示禁止，一定不要；C. couldn't不能，表示过去时态；D. needn't不必。结合句意，故选D。 【点评】本题考查情态动词的用法。 2．—How amazing this robot is! —Wow, it has video cameras in its eyes, so it “see” and interact with pe ople. A. may B. can C. must D. should 【答案】 B 【解析】【分析】句意：—这个机器人多么惊人啊！—哇，在它的眼睛里有摄像机，因此它能看见和人打交道。A. may 可以，可能；表示许可，B. can 能；表示能力，C. must 必须；D. should应该；根据it has video cameras in its eyes,可知是有能力看见，故选B。 【点评】考查情态动词辨析。熟记情态动词的含义和用法。 3．—Where is George? —He _______ be here just now. His coffee is still warm. A. need B. can't C. must D. shouldn't 【答案】 C 【解析】【分析】句意：——乔治在哪里？——他刚才一定在这里，他的咖啡还是热的。A. need需要； B. can't 不能，不可能（表示推测）； C. must 必须，一定（表示推测）； D. shouldn't不应该；根据His coffee is still warm.可知表示肯定推测一定在这儿；故答案为C。 【点评】考查情态动词。掌握情态动词表推测时的意义和用法。 4．— Sorry, I forgot to take money with me. Maybe I can't buy the book you like. — Mum, you ______ worry about it. We can pay by Alipay （支付宝）. A. can't B. needn't C. mustn't D. shouldn't 【答案】 B 【解析】【分析】句意：——对不起，我忘记带钱了。也许我不能买你喜欢的书。——妈妈，你不用担心。我们可以用支付宝支付。A. can't不能，指不允许或否定推测；B. needn't 不需，指没必要；C. mustn't不能，表禁止；D. shouldn't不应该，表建议。根据句意语境，本句是说妈妈不需要担心，故答案为B。 【点评】考查情态动词。理解句意并掌握情态动词的意义和用法区别。
最新情态动词知识点总结 一、初中英语情态动词 1．—We've got everything ready for the picnic. —Do you mean I __________ bring anything with me? A. can't B. mustn't C. couldn't D. needn't 【答案】 D 【解析】【分析】句意：—我们已经为野餐准备好了一切。—你的意思是我不必带任何东西吗？A. can't 不能；B. mustn't 表示禁止，一定不要；C. couldn't不能，表示过去时态；D. needn't不必。结合句意，故选D。 【点评】本题考查情态动词的用法。 2．All passengers ______ go through safety check before they take a plane. A. can B. may C. must D. could 【答案】 C 【解析】【分析】句意：所有乘客登机前必须接受安全检查。A. can能够，表示能力；B. may可以，表示许可；C. must必须；D. could可能，可以。登机前必须安检。故选C。【点评】情态动词词义辨析。以及can、may、must、could四个词的词义和用法。 3．A hard-working man ______ become a great scientist, but a great scientist _______ be a hard-working man. A. can't; can B. may not; must C. can't; must D. may not; can 【答案】 B 【解析】【分析】句意：一个勤奋的人可能不会成为一位伟大的科学家，但是一位伟大的科学家一定是一个勤奋的人。can't不可能，不会；can可能，能，会；may not 可能不；must 必须，一定；结合句意，可知，第一个空为“可能不”，第二个空为“一定”，故答案为B。 【点评】考查情态动词。掌握情态动词表推测时的意义和用法。 4．Look at the sign! It says “No Smoking!” You ________ smoke here. It's dangerous. A. mustn't B. ought not to C. needn't D. don't have to 【答案】 A 【解析】【分析】句意：看这个标志！上面写道“禁止吸烟！“你不能抽烟。这是危险的。 A.mustn't 禁止，不允许； B.ought not to不应该，不应当； C.needn't不必； D.don't have to 不必。根据“No Smoking!”可知此处禁止吸烟，故答案为A。 【点评】考查情态动词。掌握情态动词的意义和用法。 5．—Shall we meet at the station at 9 a.m.? —In fact we ______. The train ______until 11a.m. A. needn't; will leave B. needn't; won't leave
英语情态动词用法详解 一、单项选择情态动词 1．Look! There are so many mistakes in your composition. You ________ have fixed full attention on it. A．can B．should C．need D．might 【答案】B 【解析】 【详解】 考查情态动词。句意：看！你的作文里有那么多的错误。你本应该把所有的注意力都集中在它上面的。表示“本应该做但实际上没有做”应该用should have done结构，can have done 表示可能；need表示需要；might have done表示可能做过某事；故选B。 2．---Hi, Johnson, any idea where Susan is? ---It is class time, so she __________ in the classroom now. A．can be B．must have been C．might have been D．should be 【答案】D 【解析】 考查情态动词的用法。A. can be可能，可以是；B. must have been一定（对过去事实肯定的推测）；C. might have been可能（对过去事实肯定的推测）；D. should be应该是。句意：—知道苏珊在哪里吗？—现在是上课时间，她应该在教室里。故答案选D。 3．The room is so clean. He ________ have cleaned it yesterday evening. A．will B．need C．can D．must 【答案】D 【解析】 【详解】 考查情态动词表推测。句意：房间如此干净，他一定是昨天晚上打扫过了。must have done 表示对过去发生的事情有把握的猜测，意思是“一定（做过）”，故D项正确。 4．— Excuse me, do you mind if I open the window? — Well, if you __________. I can put on more clothes. A．can B．may C．must D．shall 【答案】C 【解析】
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 .
一、选择题 1．—Jenny, we buy Mom presents. We can clean the house from top to bottom. —Good idea! It’s a special present for Mother’s Day. A．can’t B．mustn’t C．shouldn’t D．needn’t 2．(2018·山东临沂) Could you please speak a little louder? I ______ hear you very well. A．can’t B．mustn’t C．shouldn’t D．needn’t 3．— Do you think it is safe to shop online? — I think so. On Taobao, customers return goods with no questions asked，but they ______ pay delivery costs. A．can’t; can B．must; must C．can; have to D．mustn’t; can 4．—Is Wendy in the classroom now? —I’m not sure. She ________ be there. I saw her in the library ten minutes ago. A．may not B．must not C．shall not D．would not 5．—Is that cap Bob’s? —No, it ________ be his. His is blue. A．can’t B．mustn’t C．needn’t D．may not 6．A: Is Jim coming by train? B: I’m not sure. He _______ drive his car. A．must B．may C．need D．should 7．—I can't stop smoking, doctor. —For your health, I'm afraid you ________. A．must B．can C．may D．need 8．—Sorry, Ms Wang. I left my homework at home. Must I hand it in today? —No, you_______ . You_______ bring it here tomorrow. A．mustn’t; should B．needn’t; must C．mustn’t; may D．needn’t; can 9．I see the blackboard. I need to have my glasses. A．can B．can’t C．must D．mustn’t 10．You run with the train when it is coming. It’s dangerous. A．may not B．mustn’t C．needn’t 11．—Look! Mrs. Smith is standing in front of the teaching building. —It______ her. She has gone to Egypt for her holiday. A．must be B．mustn’t be C．can be D．can’t be 12．---You look very pretty, if I say so. ---Thanks a lot for saying that. A．must B．may C．will D．have to 13．-Could you help me with my English homework, Nancy?
复习专题情态动词知识点总结 一、初中英语情态动词 1．——Do you have any plans for this summer vacation? ——I'm not sure. I ___ take a trip to Taiwan. A. must B. need C. may D. should 【答案】C 【解析】【分析】句意:一今天暑假你有什么计划吗?一我还不确定。我可能去台湾去旅行。A.必须，一定;B.需要，必要;C.可能;D.应该。根据句中I'm not sure可知，说话人还没有确定的计划，所以这只是一个可能，应选C。 2．—Where is George? —He _______ be here just now. His coffee is still warm. A. need B. can't C. must D. shouldn't 【答案】 C 【解析】【分析】句意：——乔治在哪里？——他刚才一定在这里，他的咖啡还是热的。A. need需要； B. can't 不能，不可能（表示推测）； C. must 必须，一定（表示推测）； D. shouldn't不应该；根据His coffee is still warm.可知表示肯定推测一定在这儿；故答案为C。 【点评】考查情态动词。掌握情态动词表推测时的意义和用法。 3．— __________I wear a tie to Janet's birthday party? — No,you needn't. But do remember to bring her a present. A. Must B. Should C. Need D. Can 【答案】 A 【解析】【分析】句意：——我必须戴领带去参加Jane的生日聚会吗？——不，你不必，但是记住给她带个礼物。对于must的否定回答是用needn't。而should应该；need需要；can可以。所以根据回答可知选A。 【点评】考查情态动词的基本用法。 4．—Where is Mom now? —I'm not sure. She _________ be in the kitchen. A. shall B. may C. need D. must 【答案】 B 【解析】【分析】句意：—妈妈现在在哪里？—我不确定，她也许在厨房。A. shall 将要； B. may 可以，可能； C. need 需要； D. must必须，一定；根据I'm not sure可知是不确定；故选B。 【点评】此题考查情态动词表推测的用法。
情态动词的基本用法归纳 情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。情态动词无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语。 一、can, could 1) 表示能力（体力、知识、技能）。 Can you lift this heavy box?（体力） Mary can speak three languages.（知识） Can you skate?（技能） 此时可用be able to代替。Can只有一般现在时和一般过去式；而be able to则有更多的时态。 I’ll not be able to come this afternoon. 当表示“经过努力才得以做成功某事”时应用be able to，不能用Can。如： He was able to go to the party yesterday evening in spite of the heavy rain. 2) 表示请求和允许。 -----Can I go now? ----- Yes, you can. / No, you can’t. 此时可与may互换。在疑问句中还可用could,might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。 ---- Could I come to see you tomorrow? ---- Yes, you can. ( No, I’m afraid not. ) 3) 表示客观可能性（客观原因形成的能力）。 T hey’ve changed the timetable, so we can go by bus instead. This hall can hold 500 people at least. 4) 表示推测（惊讶、怀疑、不相信的态度），用于疑问句、否定句和感叹句中。 Can this be true? This can’t be done by him. How can this be true? 二、may, might 1) 表示请求和允许。might比may语气更委婉，而不是过去式。否定回答时可用can’t 或mustn’t，表示“不可以，禁止”。 ----Might/ May I smoke in this room? ---- No, you mustn’t. ---- May/Might I take this book out of the room? ---- Yes, you can. (No, you can’t / mustn’t. ) 用May I...？征徇对方许可时比较正式和客气，而用Can I...？在口语中更常见。 2）用于祈使句，表示祝愿。 May you succeed! 3) 表示推测、可能性（不用于疑问句）。 might不是过去式，它所表示的可能性比may小。 1．He may /might be very busy now. 2．Your mother may /might not know the truth.