牛津译林版 Module4Unit2语法梳理(情态动词)
高中英语 Unit2 Sporting events语法讲解 牛津译林版必修4
情态动词C. 情态动词和否定词not连用时的简略形式D. 情态动词的用法语法专练一、单项选择1. You didn’t go to the party yesterday, or I _____ you.A. would seeB. could seeC. might have seenD. might see2. He _____ at the meeting this morning. He was in hospital then.A. can’t have spokenB. mustn’t have spokenC. shouldn’t have spokenD. needn’t have spoken3. He must be in the classroom, _____ he?A. can’tB. mustn’t heC. isn’tD. needn’t4. You _____ have brought your camera. They all had theirs with them.A. couldn’tB. needn’tC. wouldn’tD.mustn’t5. My little son _____ out alone at night.A. dares not goB. dares not to goC. dare not to goD. doesn’t dare to go6. At last he _____ finish the work ahead of time.A. couldB. was able toC. could be able toD. can be able to7. There must be some soldiers hidden in the forest. _____ any behind the church?A. Must there beB. Should there beC. May there beD. Can there be8. If anybody _____ to see me, say that I shall be back soon.A. would be comeB. comesC. cameD. should come9. —Could I have a word with you?—Yes, _____.A. you canB. you couldC. you mustD. you should10. I told him how to get here, but perhaps I _____ for him.A. had to draw a mapB. should have drawn a mapC. ought to draw a mapD. must have drawn a map11. She is late. What _____ have happened to her?A. shouldB. mustC. canD. would12. —We were waiting for you this time yesterday.—Sorry, I _____ you to tell you that I couldn’t come.A. must have calledB. would have been callingC. could have been callingD. should have called13. You _____ swim even faster than he if you practice more.A. mustB. canC. ought toD. have to14. I wonder why it’s so dark. There _____ be a heavy rain coming.A. shallB.mustC. shouldD. will15. They _____ not to make so much noise in the classroom.A. needB. dareC. canD. ought16. You _____ return the bike right now. You can keep it until he wants to use it.A. mustn’tB. may notC. can’tD. needn’t17. It’s fine and sunny outside. _____ we go out for a walk?A. MustB. WillC. WouldD. Shall18. The meeting has already begun. You _____ 10 minutes ago.A. should comeB. ought to comeC. must have comeD. ought to have come19. Little Franz wasted a lot of time playing when he _____.A. should studyB. must studyC. should have studiedD. must have studied20. If your group leader is not right, you _____him.A. mustn’t obeyB. don’t have to obeyC. wouldn’t have obeyedD. can’t have obeyedKey:1-5 CACBD 6-10 BDDAB 11-15 CDBBD 16-20DDDCB二、动词填空（用适当的情态动词填空）1. A: There were already five people in the car but they managed to take me as well. B: It _____ have been a comfortable journey.2. A: Jack, you _____ play with fire. You _____ hurt yourself.B: OK, mum.3. A: Will you stay for dinner?B: Sorry, I _____. My mother is waiting for me at home.4. A: My new pencil-box has disappeared.B: Who _____ have taken it?5. A: She looks very sad. You _____ have told her the bad news.B: But I didn’t mean to hurt her.6. A: _____ you succeed!B: Thanks a lot.7. A: A computer _____ think for itself.B: You are right. It _____ be told what to do.8. A: Shall I tell Mary about it?B: No, you _____. I have told her already.9. A: You _____ call him if you want to.B: I _____! He is sure to call me.10.A: I’m told Tom had another car accident this morning.B: I can’t believe it. He _____ have been so careless.Key: 1. couldn’t 2. mustn’t/shouldn’t, may/might/could 3. can’t 4. might/could5. shouldn’t6. May7. can’t, must8. needn’t9. can, needn’t 10. couldn’t三、句子翻译1. Michael should have come to school a little earlier in the morning.2. Barbara may/might have been ill last week.3. They should be here by now.4. He ought to know her telephone number.5. Shall I close the door?6. 这个女孩法语讲得很流利，她肯定在法国待过多年。
牛津译林版高一模块四Unit2 Modal Verbs 情态动词
高一模块四Unit2 Modal Verbs 情态动词Exercise一. can/could1. It was so noisy that we hear ourselves speak.2. Samuel, the tallest boy in our class, easily reach the books on thetop shelf.3. George (go) too far. His coffee is still warm.乔治不可能走得太远。
他的咖啡还是温的。
二. may/might1. Drivers are supposed to limit the speed in neighborhoods becausechildren be playing there.2. ——Who told you my e-mail address?—— I don’t remember clearly. It (be) Karen.三. must1. You be Carol. You haven’t changed a bit after all these years.2. It (rain) last night, for the road is quite muddy.四. need、 dare1. ——Need I accomplish all we have set out to do?——Yes, you , otherwise you would be fired.2. It was so dark outside that the little child (dare) to go out byhimself.3. To become transparent(透明)， an animal (need) to keep its body fromabsorbing or scattering light.五. will/would1. you join our discussion? 你愿意参加我们的讨论吗？2. you mind leaving us alone for a few minutes?六. shall/should/ought to1. Mike is waiting outside. he come in, sir?2. You (punish) for what you have done.3. You be late for such an important meeting.4. You (come) to the meeting earlier. 你本该早点到会场的。
牛津高中英语模块四unit2语法
Unit 2 语法情态动词一．基本概念情态动词作为谓语的一部分，无人称和数的变化；不能单独使用，与谓语动词构成完整谓语，不能单独作谓语，但在省略回答时，可单独使用。
二．基本用法（一）can 和could1.表示能力或客观可能性，还可以表示请求和允许。
e.g. Can you finish this work tonight？(表示能力)Man cannot live without air. （表示客观可能性）—Can I go now？—Yes, you can. (表示请求或允许)① could 也可表示请求，语气委婉。
主要用于疑问句，不可用于肯定句，答语应用can （即：could 不能用于现在时态的简略答语中）。
e.g. —Could I come to see you tomorrow?—Yes, you can. （否定答语可以用：No，I'm afraid not.）②can表示能力时= be able to doe.g. I'll not be able to come this afternoon.注：can 只能用于一般现在时和一般过去时（could）；be able to do 可以用于任何时态中。
2.表示惊异、怀疑、不相信的态度。
（主要用于否定句、疑问句或感叹句中）e.g. Can this be true?How can you be so careless!His cannot be done by him.3."can (could)+have+done" 的疑问或否定形式表示对过去发生的行为怀疑或不肯定。
e.g. He cannot have been to that town.Can he have got the book?4.归纳拓展① cannot but 不得不e.g. I cannot but admire his courage. 我不得不佩服他的勇气。
译林牛津版英语模块四unit-2-Grammar-and-usage
• can表示可能性时，指的是理论上的可能，它 通常不用来表示某事实际发生的可能性或真实 性。如：
• Accidents can happen．Anybody can make mistakes．
ability
can/be able to
•在过去时态的肯定句中需要某种条件或努力 做成某事，我们要用was／were able to而 不能用could。如：
need / dare
用作实义动词时，可用于各种句式． • We need to tell him the news. You don’t
need to tell him the news. • Do the flowers need watering? • I didn’t dare to tell you the truth. • Would you dare to catch the snake with
must与have to都可以表示“必须”的意思，但 要注意以下两点区别。
1) must只有现在时，而have to有现在时、过去时 和将来时。如：
We must work hard, or we’ll fail in the
examination．
Two years ago, the poor girl had to leave
•It was a holiday and the children were
able to go to the seaside．
•The girl worked hard so she was able to
pass the final test．
•I’m sorry I haven’t been able to play tennis with you recently.
高一英语牛津译林版必修四情态动词讲解和研学
高一英语牛津译林版必修四情态动词讲解与研学一。
概述：情态动词表示说话人的情感态度。
它有一定的实在词义（如：能、会、可能、以前、最好、宁愿），只有谓语特性，必须和其他动词一起构成谓语。
二．情态动词的语法特征1. 情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。
2. 情态动词除ought 和have 外，后面只能接不带to 的不定式。
3. 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。
4. 情态动词没有非谓语形式，即没有不定式、分词、等形式。
中学阶段常见的情态动词：情态动词： can(could) may(might) must will(would) shall should ought to be supposed to had better would rather need dare与情态动词相关的短语：be able to have to used to dare情态动词的固定谓语结构：情态动词+（不带to）动词不定式形式do例如：must + be done must + be doing must + have donemust + have been done must + have been doing三.情态动词的基本用法1．can1）表示能力“能够，会”She can drive, but she can’t ride a bicycle.Can you give me a lift to the station?2）表示对现在动作或状态进行主观的猜测“可能、会”，或表示惊异，怀疑，不相信等态度，主要用在否定句、疑问句或感叹句中。
例如：He can’t have a lot of money.I saw our headmaster in the dinning-room, so the man over there can’t be him.How can you be so careless!3）表示客观可能性“有时，可能”，可用于肯定句,与sometimes 连用As a human being, anyone can make a mistake sometimes.The temperature can fall to -60°C, that is, 60°C below freezing.4）表示允许“可以”，意思与may 相近，主要用在口语中Can I have a look at your copy of China Daily?This sort of thing can’t go on .5）构成下列特殊句式：①cannot /can never …too … 或cannot …enough越…越好；非常．．．．．．One cannot be too careful.I cannot thank you enough.You can’t praise him too highly.②cannot help doing …/cannot help but do …/cannot but do …禁不住；不由得；不得不I cannot help admiring the picture whenever I look at it.When a close friend dies, you cannot but feel sad.2. could1) 表示能力,指的是过去时间In those days, few workers could support their family.I couldn’t follow the teacher in class.2) 表示允许,指的是过去时间She asked whether she could take the books out of the reading-room.3) 表示可能,可以指过去时间;也可以指现在时间,表示语气缓和I didn't think the story could be true.But you mustn’t smoke while you’re walking around in the bush either. You could start a fire.He looks young .He couldn’t be over fifty .他看起来很年轻,他不可能超过五十岁.4) 比较委婉客气地提出问题或陈述看法,指的是现在时间Could I see your license?I have a few friends. I could ring to see if they’re fr ee .can(could)与be able tocan (could)和be able to表示能力时意思上没有区别.但can 只有现在式和过去式,而be able to 则有更多的形式.No one is able to do it. = No one can do it.Will you be able to come tonight?She said she had not been able to come earlier.但是,在表示成功地完成某一具体动作时用be able to 来表示。
苏教牛津译林高中英语模块4_Unit2重点词汇讲解
牛津版必修4Unit2重点词汇讲解1. delighted adj. pleased; showing delight高兴的，愉快的[搭配]be delighted to do sth. 很高兴做某事be delighted at/with …对……很高兴be delighted that … 很高兴……1) I’d be absolutely delighted to come.我非常乐意过来。
2) I’m delighted at your success.对你的成功我感到很高兴。
3) She was delighted that you could stay with her. 你能留下来陪她，她很高兴。
[单词积累]delight v.& n.使高兴；高兴，快乐delightful adj.令人愉快的delightfully adv.高兴地，快乐地[拓展]take delight in… 以……为乐delight in sth./doing sth. 以……为乐；喜欢做某事with delight 高兴地to one’s delight=to the deli ght of sb. 使某人感到高兴的是2. Significance n.重要性，重要意义be of great/little significancea matter/ speech of great/ little significance重大的/无关紧要的事/演讲1) I do not think this case is really of great significance.我认为这个案例没有太大的意义。
[拓展]significant adj.意味深长的a significant speech 意味深长的演说2) Davis was one of the most significant musicians of the last century.戴维斯是上世纪最为重要的音乐家之一。
牛津译林版高中英语必修四M4Unit2Grammar
be able to 除了可以与can互用表示能力以外，还可以指经过努力而 成功地办到了某个具体的事情，相当于manage to或者succeed in, 不可以用can。
My brother can play table tennis. He was able to flee from the prison.
Despite his enormous workload the President still seems able to find time to go fishing. I haven't been able to read that report yet.
She couldn't climb the mountain.(没有能力爬，因此也没爬) She was not able to climb the moutain.(尝试爬过，但没能爬上去)
2) 表示许可或者请求许可（正式场合用may） Canyou help me to work out this maths problem? You can borrow two books at a time from the library. 3）表示可能性，用于推测，常用于疑问句和否定句中,指“某事是否是事实”（肯定句 中要用may) Can it be true?----It can be true. Can he be so selfish? Can he be living there? Can the hall seat a thousand people?
译林牛津版高中英语必修四Unit2Grammar课件(共19张PPT)
情态动词：
can (could), may (might), must (must), have to, shall (should), will (would), need等。
情态动词的特征：
有一定的词义，但不能单独作谓语， 他们要和行为动词或连系动词连用， 构成谓语。
没有人称和数的变化，主语是第三 人称单数时，情态动词的形式不发 生任何变化。
Unit 2 Sports Events (Grammar: 情态动词 period 1)
Can you help me? You mustn’t smoke here. We can go swimming in the park. ----- 情态动词
情态动词——
指它含有一定的含义，可以表示某 种感情和说话的口气，但是它不可 以单独做谓语动词。
e.g. May / Might I usห้องสมุดไป่ตู้ your pen? No, you mustn’t.
2. May I ...? 征求对方许可；问题上 较为正式，日常用语用can.
(1) 表示推测，可能（疑问句不能用 此意）
e.g. H e may be very busy now. (2) 用于祈使句表示祝愿 e.g.
Man cannot live without air.
Could 也可以表示请求。语气委婉。 主要用于疑问句，不可用于肯定句， 答语应用can， 即could不能用于现在 时态的简略答语中。
e.g. Could I come to see you tomorrow?
Yes, you can. / No, I am afraid not.
后面接动词原形，即不带to的不定 式（ought to, have to, used to）
牛津高中英语模块四_unit_2_知识清单
Unit 2 知识清单1.①play a...role in在...中起....作用e.g. His discovery plays an important role in developing agriculture.②play the part of... 扮演...的角色2.while的用法①引导时间状语从句。
“当...的时候”e.g. While the discussion was still going on, Jim came in.②引导让步状语从句，多用于句首。
“即使；虽然”e.g. While I admit his good points I can see his bad.③作并列连词，表前后意义上的对比或转折。
“而，不过”e.g. Some people waste food while others haven't enough.④while从句中的省略。
当while从句中的主语与主句中的主语一致，且含有be的某种形式时，从句中的主语连同be可同时省略。
e.g. While listening to the radio, she fell asleep.3.delighted adj. 高兴的，愉快的① be delighted to do sth 乐意做某事e.g. He was delighted to hear that his youngest son got admission to Peking University.②be delighted with/at sth 对...感到高兴e.g. She is delighted at her son's success.4.significance n. 重要性e.g. His speech in London during the war was of great significance.①significant adj. 重要的，重大的，意义长远②be of great significance 重大的be of no/little significance无关紧要的5.①every other +时间“每隔...”(表示时间的间隔)e.g. Every other day/year/line 每隔一天/年/行②every+基数词+复数名词=every+序数词+单数名词e.g. 每两年（每隔一年）：every two years/ every second year每三年（每隔两年）：every three years/ every third year③every few+复数名词“每隔几...”e.g. every few meters 每隔几米注：few 前不能加a6.tradition n. 传统；风俗e.g. It is a tradition that the young look after the old in their family.① traditional adj. 传统的②by tradition 依照传统③keep up the tradition 保持传统pete vi.参加比赛；竞争competition n.竞争；竞赛competitor n. 竞争者；对手① compete in... 在...方面竞争e.g. Five children competed in the race.②compete for... 为...而竞争e.g. In the modern society, more and more people are competing for jobs fiercely.③compete with/ against 与...竞争e.g. Jim competes with his classmate for the gold medal of the race.He competed against his enemy for the peace of the country.8. 现在分词/过去分词作状语①现在分词作状语，与逻辑主语构成主谓关系（主动），表示时间、原因、伴随状态或起补充说明的作用。
新牛津译林版高中英语模块四 Unit 2 Grammar and usage 课件+练习
形式变化
1) 情态动词没有人称和数的变化, 人称单数的现在时也无变化。 第三
2) 有些情态动词有过去式, 有的过去式 和它的原型相同。如： can – could; shall - should
情态动词的种类
要运用好情态动词，就要首先对情态动词有 一个完整的认识，情态动词分为三种情况： 1. 只用作情态动词的有： must, can / could, may / might, ought to 2. 既可作情态动词又可作实义动词的有： need, dare，have / had to, used to 3. 既可作情态动词又为助动词的有： shall / should / will / would
must ① 表示 “必须” 或 “应当”。其否定式表 示 “不应该” 或 “不许可”, 语气比较强 烈。 ② 表示说话人对事物的推测, 意思为 “一定” 或 “准是”, 语气比may要强得多。 have to 表示 “不得不” “必须” 的概念, 比must 更含有 “客观条件使得必须如此做”, 并 有时态变化。
Make requests
Will; can; could; would A: Can/Will/Could/Would you help me with my training? B: Yes, I can/will/can/will.
may, might ① may 表示 “允许” 或 “请求”， 在口 语中可用can替代, 但may比较正式。 ② 表示说话人的猜测, 认为某一事情 “或许” 或 “可能” 发生，用might指现在的时候 语气较为委婉客气或更加不肯定; might 还可表示 “规劝”。
Permission can /could/may/might
高一英语牛津版必修四Module4Unit1~3语法
M4U2 Grammar一．情态动词的特征：情态动词有一定词义，但不完全，不能单独作谓语，须和不带to的动词不定式（ought 等除外）一起构成合成谓语；情态动词没有人称和数的变化；情态动词表示可能，能力，允诺，命令，愿望，敢于等情态。
)二．情态动词的基本形式及其否定式的简略形式(词尾+ n’ｔ原形过去式原形过去式原形过去式原形过去式can could may might must must (or: had to) ought to ought to will/won’t would shall/shan’t should need needed dare dared三、常见情态动词的用法。
1. can （能力、许可、可能性；请求，允许；惊异．怀疑，不相信态度）(1) 可以表示___可能性___用于肯定句中。
如：He can be right. 他可能是对的。
(2) can还可以表示___能力___；提出___建议____。
如：I can run very fast. 我能跑的非常快。
We can eat here, if you like.如果你愿意，我们在这儿吃吧。
(3)用于疑问句表示___许可__；__命令______；怀疑等。
如：Can I take you home? 带你回家好吗？Can you help me? 能帮我忙吗？Can it be true? 是真的吗？(4) 用于否定句表示_可能性，推测_______。
如：That can’t be Mary.那不可能是玛丽。
(5) 用于疑问句表示___惊异、怀疑、不相信、失望___。
如：Can it be true? 那是真的吗？比较：be able to 可以用于各种时态，表示不仅有能力，而且还能够做成功。
1.如：___ I was able to (managed to) finish my homework in an hour.我终于在1小时内做完家庭作业了。
英语：unit 2 情态动词(牛津译林版模块4)
情态动词1.Can & Could(1)Nearly every young people can use the computer now，but many old people couldn’t。
（2)-————Can/ Could I go out now?-———-Yes, you can。
No，you can’t/mustn’t（3）Accident can happen on such rainy days.Just be patient，You _____ expect the world to change so soon.(2010全国) A. can’t B. needn’t C. may not D。
will notYou _____ be hungry already, you had lunch only two hours ago.（2008浙江高考) A。
can’t B. wouldn’t C. mustn't D. needn’t(1)能力(2）许可（3)可能性2.may ＆might（1）You may go now.—————May/Might I watch TV after supper？—--——-Yes，you may. No, you mustn’t。
(2)He may/might have a lot of work to do and he just forgot your appointment.(1)许可(2）可能性---—-_______ I take the book out?-——-—I’m afraid not. (2010四川高考）A. Will B。
May C。
Must D. Need-—--—May I take this book out of the reading room？--———No，you ______.You should read it here。
牛津译林版 Module4Unit2语法梳理(情态动词)
情态动词考情分析高考对情态动词表示推测的考查基本集中在must,may,might,can,could的用法上。
must用于肯定的陈述句中，表示肯定的推测；may，might用于肯定和否定的陈述句中，表示可能性不大的推测，语气较弱：can用于肯定的陈述句中，表示对客观可能性的推测；can，could用于否定的陈述句和疑问句中表示推测，比may/might not 语气强。
此外要记住：对现在和将来的推测用“情态动词+动词原形”；对正在发生的动作的推测用“情态动词+be doing”；对过去的推测用“情态动词+have done”。
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。
1.can,could（1)表示能力（体力、知识、技能）。
如：Can you lift this heavy box?(体力）Mary can speak three languages.(知识）I’m going to Europe on vacation together with John if I can find the money.(技能）（2）表示请求和允许。
如：-Can l go now?-Yes.you am,/No,you can.此时可与may互换。
在疑间句中还可用could/might代替，此时could/might不是过去式，只是表示语气更委婉，不能用于肯定句和答语中。
如：-Could I come to see you tomorrow?-Yes,you an./No,I'm afraid not.（3）表示客观可能性（客观原因形成的能力）。
如：They'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。
(最新整理)牛津译林模块四unit2Grammarandusage
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mustn’t/needn’t
mustn’t 表示“禁止，不许”语气强烈； needn’t表示“不需要，没有必要”语气
较 为缓和。 (1) You mustn’t miss the speech to be
delivered tomorrow. It’s of great importance.
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Modal verbs 情态动词 can/could表能力 (1) I don’t think he can solve the problem
without any help. (2) Can you help me to work out this
maths problem?
told you. 4. 在表示建议、命令、要求动词后用虚拟语
气。 ● My friends suggested that I (should)
pay visit to shanghai next month.
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● The chairman demanded that we (should) solve the problem at once.
• To learn how to use several common modal verbs
• To learn the differences of the three pairs of modal verbs on page 30
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Now, many of us can speak English quite well, but a few years ago, we couldn’t. Yes or no? If we talk about the ability someone has, we use the modal verb ‘can’.
牛津译林版八年级英语下册Unit4重点知识点汇总 (2)
牛津译林版八年级英语下册Unit4重点知识点汇总Unit 4 A good read1.使学生掌握本单元掌握Comic strip—Task重要的短语搭配与重点词汇的意思与运用；2.对单元重点句型能够细致的理解，并能模仿句型进行写作；3.能够将每个知识点灵活地运用到单项选择和词汇运用等基础题型当中。
【聚焦中考】：Unit4 必考知识点汇编考点一：考查情态动词的用法I have to use them to reach the box on the fridge.我必须用它们来够到电冰箱上的盒子。
(教材第48页)➢中考链接—Must we take out the trash now?—______. You can do it after class.A. Yes, you mustB. No, you can’tC. Yes, you mayD. No, you needn’t【答案】D【解析】考查情态动词的用法。
句意为“我们必须现在倒垃圾吗？”“不，你们不必。
可以下课后”。
以must开头的一般疑问句，否定回答用needn’t。
考点二：考查about的用法I'm reading a book about Germany in World War II.我在看一本关于第二次世界大战中的德国的书。
(教材第49页)➢中考链接Robert Hunt sometimes advises the students _____ common problems.A. inB. aboutC. withD. for【答案】B【解析】句意：罗伯特•亨特有时就学生的常见问题提出建议。
advise sb about/on sth. 向某人就某事提出建议。
用介词on或about引出建议的具体方面。
故选B。
考点三：考查名词辨析I shouted at them—the loud noise made them all fall over.我朝他们大喊——响亮的声音使他们都摔倒了。
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情态动词考情分析高考对情态动词表示推测的考查基本集中在must,may,might,can,could的用法上。
must用于肯定的陈述句中，表示肯定的推测；may，might用于肯定和否定的陈述句中，表示可能性不大的推测，语气较弱：can用于肯定的陈述句中，表示对客观可能性的推测；can，could用于否定的陈述句和疑问句中表示推测，比may/might not 语气强。
此外要记住：对现在和将来的推测用“情态动词+动词原形”；对正在发生的动作的推测用“情态动词+be doing”；对过去的推测用“情态动词+have done”。
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。
1.can,could（1)表示能力（体力、知识、技能）。
如：Can you lift this heavy box?(体力）Mary can speak three languages.(知识）I’m going to Europe on vacation together with John if I can find the money.(技能）（2）表示请求和允许。
如：-Can l go now?-Yes.you am,/No,you can.此时可与may互换。
在疑间句中还可用could/might代替，此时could/might不是过去式，只是表示语气更委婉，不能用于肯定句和答语中。
如：-Could I come to see you tomorrow?-Yes,you an./No,I'm afraid not.（3）表示客观可能性（客观原因形成的能力）。
如：They'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。
如：Can this be true?This can be done by him.How can this be true!★考点必备情态动词表示能力时，一般用can/could 或be able to。
be able to 用于表示能力并且可用于各种时态，而can只有一般现在时和一般过去时两种时态。
此外，当表示过去成功地做成了某事时，只能用was/were able to。
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.尽管昨天晚上下大雨他还是设法去了聚会。
2.may,might（1）表示请求和允许。
might比may语气更委婉，并不是过去式。
否定回答时可用can't或mustn’t，表示“不可以，禁止”。
如：-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 l.…?征询对方许可时比较正式和客气，而用Can 1..?在口语中更常见。
（2）用于祈使句，表示祝愿如：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。
如：He may/might be very busy now.Your mother may/might not know the truth.★温馨提示(1)若用might代替may 提出请求，注意其答语不能用might。
(2）might/may表示推测，通常用于肯定句和否定句中，意为“可能”。
(3）can 和may都可表示可能性，can通常用于否定句和疑问句，而may则通常用于肯定句和否定句。
虽然两者均可用于否定句，但其意思不同：can’t意为“不可能”，may not意为“可能不”。
另外，can和may均可表示请求允许，但can为一般用词，而may为正式用语。
(4）may的常用搭配有“may well+动词原形”表示“很可能”；“may as well+动词原形”表示“调好，不妨，倒不如”。
3.must,have to（1）表示必须、必要，如：You must come in time.在回答must引出的问句时，如果是否定的，不能用mustn’t（禁止、不准），而用needn't或don’t have to(不必）。
如：-Must we hand in our exercise books today?-Yes,you must./No,you don’t have to./No, you needn't.(2)must 是说话人的主观看法，而have to则强调客观需要。
must只有一股现在时，have to有更多的时态形式。
如:The play isn't interesting.I really must go now.I have to work when I was your age.（3）表示推测、可能性(只用于肯定的陈述句中)。
如:You're Tom's good friend,so you must know what he likes best.Your mother must be waiting for you now.（4)表示与说话人愿望相反时，用must。
如:The machine must break down at this busy hour.★考点必备以must开头的问句，其否定回答用needn't或don't have to。
4.shall,should（1)shall 用于第一人称，表示征求对方的意见。
如：What shall we do this evening?(2）shall用于第二、三人称，表示说话人给对方的命令、警告、允诺、威胁或决心。
如：You shall fail if you don't work hard.(警告)He shall have the book when I finish it.(允诺)He shall be punished.(威胁)You shill have it back next week.(决心)★温馨提示should表示意外、惊异、惋惜等语气，意为“竟然”。
It's a pity that she should have failed in the entrance examination.她竟然没有通过入学考试，真是可惜。
5.will,would（1）表示请求、建议等，其中would更委婉。
如：Will/ Would you pass me the ball,please?（2）表示意志、愿望和决心，如I will never do that again.They asked him if he would go abroad.（3）would 表示过去反复发生的动作或某种倾向。
would 表示过去习惯时比used to正式.且没有“现已无此习惯”的含义。
如：During the vacation,he would visit me every other day.The wound would not heal.（4）表示估计和猜想。
如：It would be about ten o'clock when she left home.6.dare和need的用法（l）dare作情态动词时，主要用于疑问句、否定句和条件从句中，一般不用于肯定句中He daren't speak English before such a crowd,dare he?（2）need表示“需要“或“必须”，作情态动词用时，常用于否定句或疑问句中You needn't come so early.Need I finish the work today?（3）dare和need常用作实义动词，有时态、人称和数的变化。
所不同的是作为实义动词，在肯定句中，dare后面通常接带to的不定式；在否定和疑问句中，dare后面可接带to或不带to的不定式He needs to finish it this evening.Don't you dares( to)touch it?★温馨提示need和dare作情态动词时，直接加动词原形，其中dare作情态动词用时，存在过去式dared，但need作情态动词时无过去式。
7.should,ought to(1）should、ought to表示“应该”，ought to表示义务或责任，比should 语气重。
如：I should help her because she is in trouble.You ought to take care of the baby.（2)表示劝告、建议和命令。
should/ought to可通用，但在疑问句中常用should。
如:You should/ ought to go to class right away.Should I open the window?(3)表示推测。
should/ought to为客观推测，must为主观推测。
如：He must be home by now.(断定他已到家）He ought / should be home by now.(不太肯定）This is where the oil must be.(直爽)This is where the oil ought to/ should be.(含蓄）8.情态动词+have done(1)can/could+have done在肯定句中表示“本来可以做而实际未能做某事”，是虚拟语气；在疑问句或否定句中表示对过去行为的怀疑或不肯定，表示推测。
如：You cold have done better,but you didn't try your best.(虚拟语气）He can't have been to that town.(推测)Can he have got the book?(推测)(2)may/might +have done表示对过去行为的推测。