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Unit1 单元语法详解情态动词（I）情态动词的基本用法情态动词本身有一定的词义，表示说话人的情绪、态度或语气，但不能单独作谓语，只能和其他动词原形构成谓语。
情态动词用在行为动词前，表示说话人对这一动作或状态的看法或主观设想。
情态动词虽然数量不多,但用途广泛。
1. may/might(1)表示许可或征询对方意见，意为“可以”，主要用于肯定句和疑问句中。
might比may的语气更委婉。
You may park here. 你可以在这里停车。
May I speak to you? 我可以跟你说话吗？(2)may可以放在句首，表示祝愿。
固定句型为“May+主语+do”。
May you succeed! 祝你成功！May you both be happy! 祝你们二位幸福！(3)表可能性，意为“也许”，常用于肯定句（might可能性最小）。
He may refuse to speak to you, because he’s in a bad mood.他可能会拒绝和你说话，因为他的情绪不好。
例1单句填空No matter how late it ( be)，she will wait for her son to have dinner together.解析：考查情态动词。
句意：不管多么晚，她都要等儿子一起吃晚饭。
根据语境可知，此处may在让步状语从句中，表示一种可能性。
答案：may be2. can/could(1)表示具备某种能力，常译作“能”、“会”。
could主要指过去能做。
Can you play the piano? 你会弹钢琴吗？He could speak English when he was a child.当他是个孩子的时候他就会说英语。
(2)表示提出请求或征求许可。
could用于疑问句中表示委婉语气,但不用于答语中。
Can/Could I smoke here? 我可以在这里吸烟吗？(3 ) can可用于肯定句中，表示常有的行为和情形，意为“有时会，时而可能”。
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高中英语必修三考点一情态动词（ unit 1 ，unit 2）一.情态动词的分类1.只做情态动词：must、can(could)、may(might)、ought to2.可做情态动词又可做实义动词：need、dare3.可做情态动词又可做助动词：shall(should)will(would)4.具有情态动词特征：have(had) to、used to情态动词是表示说话人的情绪、态度、语气的动词，（如要求、请求、命令、应该、必要等），本身有一定的词义。
但情态动词不能单独作谓语，只能和其他动词原形构成谓语，给谓语动词增添情态色彩。
例句：I can read this sentence in English. 我能用英语读这句话。
We can be there on time tomorrow.我们明天能按时去那儿。
May I have your name? 我能知道你的名字吗？Shall we begin now?我们现在就开始吗？You must obey the school rules.你必须遵守校规。
can (could), may (might), must, need,shall (should), will (would),have to ,had better,ought to, dare (dared),.二．位置情态动词有一定的词义，但并不完整，必须与动词原形一起构成谓语。
I can see you. Come here. 我能看见你，过来吧。
He must have been away. 他一定走了。
What can I do for you? 我能帮你吗？How dare you treat us like that！你怎能那样对待我们！三．特点情态动词无人称和数的变化, 情态动词后面跟的动词需用原形,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。
人教版高中英语必修三语法总结高中英语必修三语法主要考点有情态动词、名词性从句、同位语从句等，下面是具体的高中英语必修三语法，仅供参考。
1英语必修三有哪些语法要学考点一情态动词（unit1，unit2）一、情态动词的特点:1.没有人称和数的变化。
2.有些情态动词有过去式的变化:e.g.will→would,can→could,may→might,dare→dared二、情态动词的否定式:情态动词+not+动词原形cannot:can’t,mustnot:mustn’t,neednot:needn’t三、情态动词的用法及相互区别,是考试的内容之一1.can,beabletobeableto表示经过努力后,能够做到;beableto有多种形式的变化。
can1).表示体力或脑力方面的能力;2).表示允许、可能性。
could是can的过去式,表示过去有能力及过去存在的可能性;用于疑问句表示委婉地提出问题。
1)Thefirespreadthroughthehotelveryquicklybuteveryone____getout.(NMET97)A.hadtoB.wouldC.couldD.wasableto2)-Willyoustayforlunch?-Sorry,__.Mybrotheriscomingtoseeme.(NMET99)A.Imustn’tB.Ican’tC.Ineedn’tD.Iwon’t2.may表示询问或说明一件事可不可做;表示某事有可能发生。
might是may的过去式;用在疑问中比may委婉、客气。
1)-MayItakethisbookoutofthereading-room?-No,youmustn’t.(Yes,youmay.)2)-MightImakeasuggestion?-Yes,youmay.3.must1).表示必须要做的事:必须2)表示很有把握的推断:一定,准是。
have(has)to:have(has)gotto必须,不得不。
情态动词情态动词表示说话人的语气和情态。
如需要、可能、愿意、怀疑等。
情态动词有一定的词义，但不完整，必须和主要动词的原型一起构成谓语。
常用的情态动词有：can, could, may, might, must, have to, ought to, need, dare, shall, will, should, would, be able to,及半情态动词be to do, had better等。
情态动词的基本用法：（一）can“能够”1.表示体力或脑力方面的能力，或根据客观规律能做某事的能力。
如：I can go there now.(1)can表“能够”时，既可指现在也可指将来。
(2)can与be able to的区别：①表“能力”时二者同义No one can / is able to do it.②be able to常侧重经过努力有能力做到，有多种时态。
can侧重自身的能力，只有一般现在时和一般过去时。
③was / were able to do表示通过努力克服困难或在一定的条件下成功地做了某事，侧重结果，相当于managed to do或succeeded in doing...。
could仅表自身的能力或本领，但未必成功做到。
With the help of the firemen, they were able to leave the burning house.He was able to swim across the river.In the end, we were able to rescue the workers trapped in the fire.2.表示“许可，允许”。
在疑问句中表示请求，许可；否定句中表示“不许”。
此时常与may 通用：May/Can I do it?This sort of thing can't go on! 这类事情不能再继续了！can not有时可以表示“禁止”相当于mustn't：You can't（mustn't，are not allowed to）play football in the street.你不可以在大街上踢球。
Book 3 Unit 1 Festivals around the world高考常考情态动词的基本用法总结：can1) 能力Mary can speak three foreign languages.玛丽能说三门外语。
注意：can只能表示现在的能力，could表示过去的能力，be able to do可以表示现在、将来和过去的能力，am/is /are able to do ,will be able to do,was/ were able to docould表示过去的能力，不表示是否做was/ were able to do 表示过去有能力做并且成功做了Tom could swim at the age of nine.could(过去的能力，不表是否做)汤姆在九岁就能游泳。
The fire spread through the hotel very quickly but everyone was able to get out .( was able to过去有能力做,并且成功做了)was able to 在本句相当于manage to do /succeeded to do尽管这场大火迅速蔓延到了整个宾馆，但是每个人都逃了出去。
2）许可/允许--Can /Could(表委婉/客气) I use your pen?我可以用一下你的钢笔吗？--Yes, you can.（回答只能用can）--No, I’m afraid not.3）可能（在否定句和疑问句中表示具体发生的可能性，在肯定句中表示理论上的可能性）--Can it be true ?那事可能是真的吗？--It can’t be true.它不可能是真（具体发生的可能性Harvest and Thanksgiving festival can be very happy events.（理论上的可能性）收获节和感恩节可能是非常喜庆的节日。
Book3 Unit1 Festivals around the world语法：情态动词一、归纳总结can/could 的用法。
1.I can swim. / He can speak English very well.归纳总结: .2.Can I come in? / You can watch TV.归纳总结：___ _.3.He couldn’t have left, for his bike is still here.归纳总结：___ .4.My sister has one shortcoming. She can be stubborn.归纳总结：___ .5.（了解）How could you do such a silly thing? （could 为过去式）归纳总结：用于疑问句、否定句和感叹句中表示惊讶、怀疑等感情色彩。
6.can/could 的固定短语:can’t but do___ can’t be too..._ _can’t help doing___ _ can’t be...enough___as...as one can/possible___ _can’t wait to do..___ _①*每当我看到这张照片，我就禁不住想起您为我们做的事情。
__②*我们有必要尽可能的经常锻炼身体。
__③*你最好尽可能的多与老师交流。
__④*他如此伟大，我们怎么表扬也不过分。
__⑤*当我听到他的故事时，我不得不钦佩他的胆量。
__⑥*我迫不及待的邀请你担任这次英语演讲比赛的评委。
__ __7.be able to 与can① *I’m sorry to tell you that I won’t be able to attend the lecture tomorrow.② *In this way ,you may be able to pay attention to what the teacher says.③ I could climb trees when I was younger.He was able to go to the party yesterday in spite of the heavy rain.归纳总结：be able to 与can: ___①“In the 1960s we were all a little wild and couldn’t get away from home far enough or fast enough to prove we could do it on our own,” says Christine Crosby. (翻译)____ (persuade) into buying ② While shopping, people sometimes can't helpsomething they don't really need.③She can't help ____ _ (clean)the house because she's busy making a cake.二、归纳总结may/might 的用法No, you mustn’t1.You may take this seat if you like. May I …?Yes, please. / Sure, go ahead.归纳总结：___ .2.Your math teacher may be in his office.—What has happened to George? —I don't know. He may have got lost.归纳总结：___ .3.May you succeed!归纳总结：__ _.4.What you say may/might well be true.It’s not far, so we might/may as well go on foot.归纳总结: may 短语___ __.三、归纳总结must 的用法。
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高中新人教版必修三英语第一单元语法知识点
对于语感不好的同学来说语法就是做题的重要依据，掌握好英语第一单元语法知识点可以帮助大家更好的进行其中复习，我们预祝大家在期中考试有很好的分数。
1. 情态动词定义: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。
2. 分类：
情态动词有四类：
①只做情态动词：
must,can(could),may(might),oughtto
②可做情态动词又可做实义动词：
need,dare
③可做情态动词又可做助动词：
1。
名师讲语法：情态动词的用法阅读、观察下列句子，体会情态动词的用法。
①I'm fond of my sister but she can be really stubborn.②“You must have a wrong number，”she said.“There's no one of that name here.”③Doctors say that exercise is important for health，but it must be regular exercise.④I'm afraid Mr.Harding can't see you now. He's busy.⑤—May I take this book out of the reading room?—No，you mustn't. You read it in here.⑥—I haven't got the reference book yet，but I'll have a test on the subject next month.—Don't worry. You shall have it by Friday.⑦It can't be the postman at the door.It's only six o'clock.⑧Some young people these days just won't go out of their homes to contact the real world.⑨—I don't really like James.Why do you invite him?—Don't worry.He might not come.He said he wasn't certain what his plans were.⑩—Why didn't you come to Simon's party last night?—I wanted to，but my mom simply would not let me out so late at night.[自我总结] 1.句①和句④中的can表可能性，句⑦中的can't表推测。
2020学年人教版高中英语必修三情态动词一、warming-up二、presentation（一）情态动词情态动词表示说话人对某一动作或状态的_______。
情态动词_______人称和数的变化。
但不能单独作谓语动词用，必须和动词原形连用构成谓语动词。
（ought to 除外）。
疑问式：____________________________；否定式：____________________________；1、can和could的基本用法(can\ could\ be able to辨析)(1)______ _______ 表示“________”译为“_________”，( )如：He can speak English better than you.A blind man cannot judge colors.Computers can recognize human voices.Liu Xiang can run the 110m hurdle race within 13 seconds.In those days, few workers could support the family.(2)______ _______ 表示“________”译为“_________”，( )如：Even an experienced teacher can make mistakes.The temperature can fall to －10℃.I don’t think the story could be true.He looks young. He couldn’t be over fifty.(3)______ _______ 表示“________”译为“_________”，( )如：You can go now.Anyone can’t smoke here.She asked whether she could take the books out of the reading room.(4)______ 用于_____ _____ _____中，表示“_____________________________________”如：He can’t be in the classroom now, for the light is out.Can the man over the be our headmaster.The story can’t be true!How can you be so careless!He is such a nice person that he can’t fool me out of my trust.(5)______ 用于_____ 中，表示“_________________”, 对于这一请求的回答用”______”如：Could I come here again tomorrow?Could I have the television on?(6)can和be able to都可表示_______，但是be able to有__________。
Unit 1 语法Can/ could/ be able tocan、could与be able to都可以用于表示能力，区别在于：1. can仅表示某人现在有能力做某事，相当于am/is/are able to，但后者更正式。
例如：The police are doing all they can to find her.警方正在尽一切所能找她。
2. could表示某人在过去有能力做某事，相当于was/were able to。
例如：By the time she was eight, she could read Greek and Latin.她八岁时就会读希腊文和拉丁文了。
He was able to walk with a stick.他能拄着拐杖行走。
3. 表达将来有能力做某事用will be able to do。
例如：After only a few lessons, you will be able to understand basic Spanish.只需几节课之后，你就能听懂最基本的西班牙语了。
4. can、could仅能表达现在或过去的能力，但be able to 还含有成功地做成了某事，相当于manage to do sth./succeed in doing sth.。
例如：The fire spread through the hotel very quickly but everyone was able to get out.这场大火迅速蔓延到了整个宾馆，但是每个人都逃了出来。
I'm sorry that I wasn't able to phone you yesterday.对不起，昨天我没能给你打电话。
can、could除了表示能力还可用于以下用法：1. 表示请求和许可表示请求时，could更加委婉，不表示过去。
注意：could 通常不表示许可，因此回答仍用can。
