2021届高考英语语法一轮复习精讲精练情态动词之高考真题精选(3)

2021年高考英语真题和模拟题分项汇编专题02 动词的时态和语态及情态动词、虚拟语气一、2021年高考真题1. (2021年高考全国甲卷语法填空)The Xi'an City Wall is the most complete city wall that has survived China's long history. It ___41___ (build) originally to protect the city in the Tang dynasty and has now been completely restored (修复).…….We ___46___ (hire) our bikes from the rental place at the South Gate.【答案】41.was built 46.hired【解析】46.考查被动语态。

句意：它最初是为了保护唐代的城市而建造的，现在已经完全修复了。

分析句子可知，空格处为谓语，动词build和主语之间是被动关系，应用被动语态(be done)，根据句意和时间状语the Tang dynasty可知，用一般过去时，谓语动词用过去式，主语it为第三人称单数，主谓一致，故填was built。

47.考查时态。

句意：我们从南门的租赁处租了自行车。

分析句子可知，此处为谓语动词，根据上下文可知，此处描述过去发生的事情，用一般过去时，谓语动词用过去式。

故填hired。

2.(2021年高考全国甲卷短文改错) They kept very much to themselves. In my opinion, whenever in trouble, we should seek help from those we trust most.考查时态。

句意：他们很自闭。

结合前文可知，文章的时态用一般现在时。

所以此处的kept改为keep。

2021届海南新高考英语必考语法之情态动词精品讲练情态动词是近几年高考的重点考查项目。

对情态动词的考查主要侧重于can/could，may/might，must，shall/should等的基本用法的考查，其中“情态动词＋完成式”结构表示对过去发生的事情的推测，是考试的重点。

以后高考对情态动词的考查将有如下变化：有效信息越来越隐蔽、情景越来越生动、考查角度越来越综合化，这些变化无疑会增加试题难度，因此，考生要给予足够的重视。

情态动词的基本用法1．can，could和be able to：can表示“有能力做某事”，只有现在式和过去式两种形式；be able to 可用于各种时态，强调通过努力而成功地做某事，相当于manage to do或succeed in doing。

如：The village was destroyed in the earthquake but that little dog was able to survive.这个村庄在地震中毁灭了，但那只小狗竟然活了下来。

2．may，might(might为may的过去式)：(1)表示许可，意为“可以”。

(2)表示可能性，might的可能性更小。

(3)“May＋主语＋动词原形”表示祝愿。

3．must可用来表示必要性，意为“必须”，常用于肯定句中。

用在否定句中时，其否定形式为must not或mustn't，意为“禁止，不许”。

若表示没必要或不必做某事用don't have to do sth.或needn't do sth.。

must 还可表示“偏偏，非要”，多用于疑问句中。

4．shall用于第一、三人称的疑问句中，表示征求对方的意见或向对方请示。

用于第二、三人称的陈述句中，表示说话人给对方的命令、警告、允诺、威胁等。

用于第三人称，在条约、规定、法令等文件中表示义务或规定，意为“应该，必须”。

should表示责任或义务，意为“应当，应该”。

2021届衡水中学新高考英语语法三轮复习讲义[103]情态动词小结情态动词是高考考查的重点语法项目之一。

本期的语法主要是与各位共同分享高考情态动词的常见考点：一：表示允许的情态动词【例子】选用括号内合适的内容填空。

1. ________ (Can / Shall) I have a word with you? It won't take long.2. —________ (Will /May) I take the book out?—I'm afraid not.【分析】1. Can。

根据have a word with you可知，此处是在请求对方允许，故选Can。

could也可以表示许可，主要用于疑问句。

2. May。

由I'm afraid not可知，设空处表示允许，故选May。

二：表示推测的情态动词【例子】选用括号内合适的内容填空。

1. You ________ (must /shall) be Carol. You haven't changed a bit after all these years.2. You ________ (may /should) feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful you did it.3. Although you ________(must / can) find bargains in London, it's not generally a cheap place to shop.4. Life is unpredictable;even the poorest ________ (might / shall) become the richest.5. I'm afraid Mr. Harding________ (can't / needn't) see you now. He's busy.【分析】1. must。

（新人教版）2021版高考英语一轮复习语法情态动词和虚拟语气语法训练Ⅰ.单句语法填空1.Mary,you have been here for several years.You be used to Chinese food.2.They wanted to find someone who use computers skillfully.3.A recent study shows that being pulled into the world of a fascinating novel make some actual, measurable changes in the brain.4.The world becomes so indifferent.It’s time that we (take) some measures to improve it.(2019浙江丽水5月高三模拟)5.The young firefighter insisted that he was well-prepared and (send) there to put out the fire.(2019四川成都七中段考改编)6.Oh,dear! Are you still doing your homework? You have finished your homework yesterday.7.My mom suggests that we eat out for a change this weekend.(2019河北石家庄质检)8.Grace doesn’t want to move to New York because she thinks if she (live)there,she wouldn’t be able to see her parents very often.(2019山东济南模拟)9.Don’t handle the vase as if it (make)of steel.(2019四川绵阳质检)10.We lost our way in that small village,otherwise we would (visit)more places of interest yesterday.(2019江西瑞金模拟)答案及剖析:1.must 句意:Mary,你到这里已经多年了。

2021年高考英语语法总复习：情态动词之高考真题精选（3）1. He is a bad-tempered fellow, but he __________be quite charming when he wishes.A. shallB. shouldC. canD. must答案：C解析：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，他能够变得相当可爱。

根据句意可知此处表能力，意为“能、可以”，故C项正确。

2. Traveling by subway __________sometimes be quite an adventure, especially during the rush hour.A. mustB. canC. shallD. should答案：B解析：句意：乘地铁旅行有时可能相当冒险，尤其是在交通高峰期。

根据句意可知，本句中表示客观可能性，只能用can，故选B。

3. It be the vocabulary that caused you the problem in the exercise because you know a lot of words.A. mayB. couldn’tC. shouldD. needn’t答案：B解析：句意：在练习中不可能是词汇量给你造成这样的问题的，因为你认识很多词汇。

根据原因状语从句because you know a lot of words可知，主句应该是否定的，A项和C项可排除．needn’t表示“不必”．此处为对可能性的推测，couldn’t表示“不可能”．根据句意可知，B项符合语境，故选B．4. Using AI, many companies are now conducting experiments that__________ possible just a few years ago.A. would have beenB. might have beenC. shouldn't have beenD. couldn't have been答案：D解析：句意：很多公司现在使用人工智能进行试验，这在几年前是不可能的。

高考英语一轮复习语法点专题讲解情态动词编辑整理：尊敬的读者朋友们：这里是精品文档编辑中心，本文档内容是由我和我的同事精心编辑整理后发布的，发布之前我们对文中内容进行仔细校对，但是难免会有疏漏的地方，但是任然希望（高考英语一轮复习语法点专题讲解情态动词）的内容能够给您的工作和学习带来便利。

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情态动词情态动词顾名思义就是表示情感和态度的词，常见的有:can （could）； may (might)； must; have to； shall （should)； will (would）； need; dare （dared); ought to; 情态动词没有人称和数的变化，不能单独使用,它与其后的动词原形合成谓语结构。

它们的用法如下:一. can和could 的用法1.表示能力或客观的可能性，还可以表示请求和允许.如：Can you finish this work tonight？Man cannot live without air。

— Can I go now？— Yes， you can.注意：1)could表示语气较委婉的请求,主要用语疑问句，（用于此意义时不用在肯定句）答语用can。

— Could I come to see you tomorrow?— Yes， you can. （不能用could）。

(否定句常用No，I’m afraid not.）2)can表示能力时，还可以用“be able to" 代替，例如:I’ll be able to come this afternoon。

但当我们要表示“某件事已成”时，须用“was （were）able to”不能用could，例如：He was able to go to the party yesterday evening and he enjoyed himself verymuch.2.表示“惊异、怀疑、不相信”的态度。

高考英语情态动词讲解及习题(附答案)(总8页)--本页仅作为文档封面，使用时请直接删除即可----内页可以根据需求调整合适字体及大小--情态动词常见的情态动词有：can 能may 可以will，would （表意愿）need 需要dare 敢must 必须have to 不得不shall，should 应该（表义务）ought to 应该，could 的用法表能力，有“能”、“会”、“能够”的意思例如：Can you drive a car你会开车吗？-----Yes, I can. 我会。

-----No, I can't. 我不会。

表允许，在口语中代替 may，有“可以”的意思例如：Can I use your bike? 我可以用你的自行车吗？表示可能性，常用于否定句和疑问句例如：Can it be true? 那会是真的吗？Today is Sunday. He can't be at school. 今天是星期天。

他不可能在学校里。

过去式could表示的语气更加委婉、客气例如：Could I come to see you tomorrow? 明天我可以来见你吗？can 和 be able to 的比较1) can 只有一般现在时和一般过去时两种时态(could)，其他时态要用be able to的形式例如：I haven't been able to get in touch with her. 我一直没能和她联系上。

2) 通常can 和 be able to 可以互换例如：He will come if he can.如果可能的话，他一定会来。

，might的用法表示许可或征求对方的许可，有“可以”的意思。

例如：You may go now. 你可以走了。

May I use your computer? 我用一下你的电脑可以吗？回答以may开头的疑问句有如下表达法：例如：May I smoke here我可以在这儿抽烟吗？-----Yes, you may.-----Yes, please.------No, you can't.------No, you mustn't.------No, you'd better not. 表示猜测，通常只用于陈述句例如：You may be right. 你可能是对的。

考点七情态动词和虚拟语气限时25分钟一、单句语法填空1．We ________ (enjoy) the sunshine in Sanya now if it were not for the delay of our flight.答案：would be enjoying 句意：要不是耽搁了航班，我们现在正在三亚享受阳光。

根据后面的“now”和“if it were not for ...”可知，此处是对现在状况的虚拟，故主句用would be doing。

2．When I was small, my mom ________ read me stories at night.答案：would 句意：当我小时候，我母亲常常在晚上给我读故事。

would “过去常常”，表示过去的习惯性的行为。

3．The accident ________ have been caused by a dog running across the road, but we don't know for sure.答案：might 句意：事故可能是由一条横穿马路的狗引起的，但我们不确定。

分析句子可知，本句是对过去动作的推测，可能性不大，故填might。

4．He looked so hungry as though he ________ (eat) a decent meal for a month.答案：hadn't eaten 句意：他看起来如此饿好像已有一个月没有吃过一顿像样的饭了。

由主句中的looked可知，as if/though后面跟过去完成时表示对过去的虚拟。

5．I was caught in a traffic jam for over an hour, otherwise, I ________ (keep) you waiting for such a long time.答案：wouldn't have kept 句意：我在交通堵塞中被困了一个多小时，否则我不会让你等这么长时间。

2021年高考英语语法总复习：情态动词之高考真题精选（1）1.It was so noisy that we hear ourselves speak.A. couldn’tB. shouldn’tC. mustn’t D needn’t答案：A解析：句意：太吵了以至于我们不能够听到我们自己在说什么？根据句意可知, 此处表示能力，故答案为A2. Lack of sleep _________lead to weakened immunity and memory, and also slow physical growth.A. shallB. mustC. shouldD. can答案：D解析：句意：睡眠不足可能会导致免疫力和记忆力下降，还会减缓身体发育。

这里表示理论上或是客观上的推测，使用用can，故选D。

3. —I heard they went skiing in the mountains last winter.—It true because there was little snow there.A. may be notB. won’t b eC. couldn’t beD. mustn’t be答案：C解析：句意：—我听说他们去年冬天去山里滑雪。

—不可能是真的，因为那里几乎没有雪。

根据because there was little snow there可知这里是否定推测，couldn’t be “不可能是”符合句意，故选C项。

4. My sister met him in the street yesterday afternoon, so he _________your lecture.A. shouldn’t have atten dedB. couldn’t have attendedC. mustn’t have attendedD. needn’t have attended答案：B解析：句意：我的姐姐昨天下午在街上遇见了他，所以他不可能去听了你的演讲。

高中英语语法--情态动词复习+练习情态动词，即表示人的情感和态度的动词，它们本身有一定的词义，但是不能独立作谓语，只能跟动词原形一起构成谓语。

情态动词虽然数量不多，但用途广泛。

常见的情态动词主要有：can(could)，may(might)，must，need，shall(should)，will(would)，dare等。

1．can与could的用法(1)表示能力(could是过去时)。

My grandmother can do some shopping on the Internet，but she couldn’t last year.我奶奶会网购了，但是去年她还不会。

(2)表示猜测，意为“可能”，一般用于疑问句和否定句(could是过去时)。

Can this news be true？这则消息是真的吗？(3)表示请求和许可(could表示更委婉的语气，回答时只能用can)。

—Can/Could I go now?—Yes，you can.——我现在可以走了吗？——是的，可以。

(4)用于肯定的陈述句中，表示理论上或习惯上的可能性。

As we all know，anyone can make mistakes.我们都知道，任何人都可能犯错。

(5)习惯用法“cannot...too...”表示“无论怎样……都不过分，越……越好”。

有时cannot可用can never替代。

We cannot thank you too much for what you’ve done for us.对于你们为我们所做的一切，我们怎么感激你们都不过分。

2．may与might的用法(1)表示允许、许可。

might在语气上比may更委婉。

以may/might开头的问句在否定回答中要用mustn’t/can’t。

—May/Might I play the computer games after supper?—Yes，you may./No，you mustn’t/can’t.——晚饭后我可以玩电脑游戏吗？——是的，可以。

2020-2021年历年全国高考英语情态动词试题汇总及答案一、单项选择情态动词1．While it wasn’t the goal of the trip, I was rewarded with fresh insights, ones that ________ to me during the regular course of business.A．might never happen B．could never have happenedC．should not happen D．nee dn’t have happened【答案】B【解析】【详解】考查虚拟语气。

句意：虽然这并不是这次旅行的目的，但我得到了一些新的领悟，那些领悟在我的日常生活中是本不可能发生的。

此处考查虚拟语气，“我得到新的领悟”发生在过去，故此处是与过去事实相反，应用could/might/would/need/should+have done，“本不可能发生”是could never have happened，故选B项。

【点睛】本题考查“情态动词+have done”的虚拟语气，其常用表达有：could have done本能做某事而未做couldn’t have done不可能做了某事should have done本应该做某事而未做shouldn’t have done本不应该做某事而做了would have done本会某事而未做wouldn’t have done本不会做某事而做了need have done本需要做某事而未做needn’t have done本不必要做某事而做了2．Mr. Baker, some students want to see you. ______ they wait here or outside?A．May B．Should C．Shall D．Will【答案】C【解析】【详解】考查Shall的用法。

2021年高考英语情态动词语法专题XX年《高考风向标》•英语目录第一部分教材梳理必修一unit 1 friendship单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 2 english around the world单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 3 travel journal 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 4 earthquakes单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 5 nelson mandela—a modern hero 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测必修二unit 1 cultural relics 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 2 the olympic games 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 3 computers 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 4 wildlife protection 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 5 music单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测必修三unit 1 festivals around the world 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 2 healthy eating单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测unit 3 the million pound bank note 单元要点预览语言要点词语辨析词性变化重点单词重点词组重点句子课文要点课文词汇填空课文大意概括课文佳句背诵与仿写单元自测……第二部分语法专题专题一冠词专题二名词专题三代词专题四数词专题五形容词和副词专题六介词专题七情态动词专题八非谓语动词专题九动词和动词短语专题十动词的时态专题十一动词的语态专题十二句子种类专题十三名词性从句专题十四定语从句专题十五状语从句专题十六倒装句和省略句专题十七强调句专题十八虚拟语气专题十九主谓一致专题二十直接引语和间接引语第三部分高考题型讲练听力完形填空语法填空阅读理解信息匹配基础写作读写任务第二部分语法专题版权所有：专题七情态动词i、重点难点解析情态动词的高考命题导向：情态动词表示说话者的情感和态度，有一定的含义，但是不能单独做谓语，必须与其他动词连用。

2021年高考英语语法总复习：情态动词之高考真题精选（2）1. Samuel, the tallest boy in our class, _________ easily reach the books on the top shelf.A. mustB. shouldC. canD. need答案：C解析：句意：Samuel，我们班最高的男生，能很轻松地够着书架顶上的书。

此处需要一个表示能力的词，故用can2. In today’s information age, the loss of data _________ cause serious problems for a company.A. needB. shouldC. canD. must答案：C解析：句意：在今天的信息时代，数据的丢失有时可能会对一个公司造成严重的问题。

数据丢失造成严重问题是客观或理论上可能会发生的情况，即“理论或客观可能性”，用情态动词can。

3. ― Isn’t that Ann's husband over there?― No, it __________be him — I'm sure he doesn't wear glasses.A. can'tB. must notC. won'tD. may not答案：A解析：句意:—那边的那个是Ann的丈夫吗？—不，不可能是他。

我确信他不带眼镜的。

根据I'm sure he doesn't wear glasses，可知答案为A不可能。

4. He _________writing the paper now. He hadn’t written a single word when I left him ten minutes ago.A. sho uldn’t beB. can’t have finishedC. can’t beD. mustn’t have finished答案：B解析：句意：他现在不可能写完了卷子。

备考2021年高考英语一轮复习08：情态动词一、单选题1. Jim says we ______ stay in his house as long as we leave it clean and tidy.A . mustB . canC . needD . should2. It was so noisy that we hear ourselves speak.A . couldn’tB . shouldn’tC . mustn’tD . needn’t3. —I wonder whether Helen will be here by five.—Her mother said she left home at half past four. She ________ be here at ten past five.A . dareB . shouldC . shallD . need4. I’ve ordered some pizza, so we _______ worry about cooking when we get home tired.A . can’tB . dare notC . needn’tD . may not5. — Henry was forced to leave for the invalid visa.— He __________the period of timeA . should have extendedB . must have extendedC . may have extendedD . would have extended6. Whatever _______happen, we are not going to give up our determined plan.A . mayB . mustC . canD . should7. Imitating others’ actions in Tik Tok _____ be very dangerous, so youcan’t be too careful.A . shouldB . shallC . mightD . can8. — Will the monthly allowance of $ 500 cover all your living expenses?— I ________ have no problem with money, as I am quite good at handling it.A . mightB . shouldC . couldD . would9. —It’s really a pity that you didn’t go to see Frozen II last night.— I ________, but I had to prepare for the coming exam.A . would like toB . ought toC . would haveD . should have10. Playing computer games cost the boy plenty of time he ________ have spent doing his lessons.A . ought toB . shallC . mayD . must11. We _______ the assignment ahead of time had you explained the objective to us earlierA . could completedB . would completeC . should completeD . could have completed12. —I didn’t know you were good friends.—You _______. I have known her since she moved here. You were studying abroad then.A . may haveB . needn’t haveC . couldn’t haveD . must have13. —It’s so hot and uncomfortable here! Why are your windows still closed?—Oh, I’m not to blame. They _______ open.A . shan’tB . mustn’tC . won’tD . wouldn’t14. —Why did Mary ignore me at the party last night?—She you. She wasn’t wearing her glasses.A . shouldn’t have seenB . needn’t have seenC . won’t have seenD . might haven’t seen15. —-You really did a good job, Robert!—I was just doing my job and anyone in my position ________ the same like me.A . might do AB . could doC . should have doneD . would have done16. He slept like a log through all the noise—he ________ very tired.A . must beB . might have beenC . might beD . must have been17. — Why do you care about him so much?— You ________him when he first came out— it was so sad.A . would have seenB . should have seenC . might have seenD . could have seen18. Interested in painting, he ________ paint with pen and paper after work, gradually cultivating himself into a self­taught painter.A . wouldB . mustC . mightD . should19. —Sorry, I missed your party yesterday because of an unexpected visitor.— Actually, you _______ the party. It was canceled at the last moment.A . didn’t need to attendB . needn’t have attendedC . shouldn’t have attendedD . shouldn’t a ttend20. Now that he’d come to the door, he thought he _______ as well go in with the others to have a look.A . mightB . couldC . shouldD . must21. I wonder what makes TikTok appeal to people of all ages. People have wasted so much of their time which _______ for other more meaningful things.A . could have been savedB . would be savedC . must have been savedD . should be saved22. If students don’t take headmaster’s advice offered at the graduation ceremony seriously, they _______ pay aconsiderable price in the years ahead.A . mustB . mayC . canD . should23. —Jim ________ what I said annoying though he didn’t say anything.— So you mean you will have to apologize to him?A . must findB . might findC . should have foundD . must have found24. —I phon ed you yesterday morning. A girl answered, but I didn’t recognize the voice.—Oh, it ________ my younger sister. She was in my room at that moment.A . must have beenB . should have beenC . could have beenD . may have been25. —Are you going on a holiday after the exam?—Well, I haven’t decided yet. I ________ find some other choices.A . wouldB . mightC . mustD . should26. He _____ his stay in France, didn’t he? He looks amazingly different.A . will have enjoyedB . should have enjoyedC . can have enjoyedD . must have enjoyed27. Skills like critical thinking and analysis ________ be found on the Internet, because they must be acquired in the context of facts.A . can’tB . needn’tC . mustn’tD . shouldn’t28. My computer ________ start this morning. There must have been something wrong with it.A . wouldn’tB . shouldn’tC . couldn’tD . mustn’t29. You _____ be right but I’m going back to check anyway.A . shouldB . mustC . needD . might30. In order to succeed, it is compulsory that you ____work with every fiber of your being.A . mightB . shouldC . couldD . must31. I ______my examination easily but I made too many stupid mistakes.A . should passB . could have passedC . had passedD . must have passed32. According to the latest rule, people _______sort household garbage into four categories.A . canB . shallC . mayD . need33. —I feel washed out. Let’s call it a day.—Hold out a little longer. Now that we have come so far. We ______ as well go all the way.A . canB . mustC . shouldD . may34. In today’s infor mation age, the loss of data _________ cause seriousproblems for a company.A . needB . shouldC . canD . must35. Yesterday, Jane walked away from the heated discussion. Otherwise, she _____ something arbitrary that she would regret forever.A . must have saidB . saidC . might sayD . might have said36. The door open, no matter how hard she pushed.A . shouldn’tB . couldn’tC . wouldn’tD . mightn’t37. I______ thank you too much for all your help to my son while we were away from home.A . won’tB . can’tC . canD . will38. —Do you mean the neighbors are coming over to discuss the problem?—Yes, the whole thing has got intolerable, or they ________ have to be calling a meeting.A . mustn’tB . can’tC . wouldn’tD . shouldn’t39. —_______ you disturb me now? I’m busy preparing a report.— Terribly sorry, but I have something urgent to tell you.A . NeedB . ShouldC . MightD . Must40. —I feel a little nervous.— T ake it easy. You ______have difficulty passing the exam when you have prepared for it well.A . mustn’tB . needn’tC . may notD . shouldn’t。

2021届衡水中学新高考英语语法三轮复习讲义[86]情态动词一、一些情态动词的常见用法1. can和may都可表示允许。

如：Can / May I take the book out?2. would和used to都可表示“（过去）常常”，但“would +动词原形”单纯表示过去经常做某事，而“used to +动词原形”表示过去常常做某事而现在不做了。

如：Bob would always turn and wave at the end of the street.I used to smoke, but I gave up a couple of years ago.3. may, might, could, must都可表示肯定推测，其中，might 语气最弱，must语气最强。

must表推测时，否定句和疑问句中用can。

如：It may or may not rain.I'm not sure I'll go to Jeff 's Party. I might go to the concert instead.It could cost your life if you are not careful.You must be Mr. Smith. I was told to pick you up.The girl riding the bike can't be Mary. She's in New York.There's some one outside. Who can it be?二、一些情态动词的特殊用法1. should表示惊异，意为“竟然”。

如：It wasn't right that such near neighbours should not know one another.2. must表示“偏要，硬要”。