高中英语知识点：情态动词
高中语法-情态动词
高中语法-情态动词一、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He can speak English.I can go there now.(1)can 表示能够时，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 或者succeeded in doing ，could仅表示自身的能力或本领，但未必成功做到。
With the help of the fireman, 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！3.表示推测，主要用于疑问句和否定句，表示推测、估计时，后边可根据不同情况用动词原形、进行式、完成式。
Who can he be?She can’t be waiting for you.He can’t have gone there alone.4.强调客观可能性：可做”有时候会…”，意思是平时或大部分时间不是这样子，只是偶尔发生的事情，如：Jogging can be harmful to the health.5.表惊讶、疑虑How can it be that he was late for the opening ceremony?他咋会连开幕式都迟到呢？Can it be late? 会不会晚了？构成下列句式① can not/ can never…too… 或cannot … enough “无论怎么…也不过分：越…越好；非常…”One cannot be too careful. 越认真越好。
高中英语知识点归纳情态动词和一般现在时的否定和疑问句总结
高中英语知识点归纳情态动词和一般现在时的否定和疑问句总结情态动词 (Modal Verbs) 是英语中一类特殊的动词形式，用来表示说话人对某种行为或状态的态度、推测、可能性、必要性、能力等。
一般现在时的否定句 (Negative Sentences in Simple Present Tense) 是用来陈述某种情况或事件常态发生的句子形式，表达否定的意思。
一般现在时的疑问句 (Interrogative Sentences in Simple Present Tense) 是用来询问某件事情是否发生或存在的句子形式，表达疑问的意思。
以下是对高中英语中情态动词及一般现在时的否定和疑问句的归纳总结：一、情态动词 (Modal Verbs) 的用法：1. 可能性 (Possibility)：- can- could- may- might2. 推测 (Speculation)：- must- should- may/might3. 必要性 (Necessity)：- must- have to- need to- should4. 动词表示能力 (Ability)：- can- could- be able to5. 动词表示许可 (Permission)：- can- could- may- might6. 动词表示请求 (Request)：- can- could- will7. 动词表示允诺 (Promise)：- will- shall- would8. 动词表示建议 (Advice)：- should- ought to- had better二、一般现在时的否定句 (Negative Sentences in Simple Present Tense)：1. 在一般现在时的肯定句中，在动词前加上助动词 "do" 或 "does"，并加上 "not" 以构成否定句。
高中英语知识点归纳情态动词和将来时的否定和疑问句总结
高中英语知识点归纳情态动词和将来时的否定和疑问句总结情态动词和将来时的否定和疑问句是高中英语中的重要知识点。
掌握了这些知识，可以帮助我们更准确地表达自己的意思，提高英语的应用水平。
本文将对情态动词和将来时的否定和疑问句进行总结。
一、情态动词1. 情态动词的定义情态动词是一种特殊的助动词，用来表示说话人对某种情感、意愿、能力、可能性和推测等的态度。
常见的情态动词有can, could, may, might, shall, should, will, would, must等。
2. 情态动词的用法(1) 表示能力和可能性：- can：表示现在或将来的能力或可能性；- could：表示过去的能力或可能性；- may/might：表示现在或将来的可能性；- must：表示很大程度上的可能性。
(2) 表示意愿和建议：- shall：用于第一人称单数（I）或复数（we）的将来时，表示征求意愿或提出建议；- should：表示建议、义务或推测。
(3) 表示推测和判断：- will：用于第二人称或第三人称时，表示推测、猜测或意愿；- would：表示比较客观的推测或意愿。
3. 情态动词是否接动词原形情态动词后面通常接动词原形，而且主语在情态动词后面。
但是，有些情态动词在后面接动词的过去分词形式，例如can/could be,may/might be, must be。
二、将来时的否定和疑问句1. 将来时的否定句将来时的否定句是通过在助动词will后面加not构成的，即will not 或won't。
例如：- He will not go to the party.- They won't arrive on time.2. 将来时的一般疑问句将来时的一般疑问句是通过将助动词will提到句子的主语前面构成的。
例如：- Will she come to the meeting?- Will they finish the work on time?3. 将来时的特殊疑问句将来时的特殊疑问句是通过疑问词（如what, when, where, why, who, how等）+ 助动词will + 主语 + 其他部分的方式构成的。
高中英语语法讲解情态动词
高中英语语法讲解情态动词概述1. 共有10个情态动词：can/could, may/might, will/would, shall, should, ought to, must；2个半情态动词need,dare2. 特点：（1）情态动词后加动词原形（即不带to的不定式）一起构成谓语；（2）没有人称和数的变化；（3）多数情态动词有过去式，但其过去式有时并不表示时态，而只起“委婉或不确定语气”的作用。
Would you do me a favour?She may/might be watering the flowers now.3. 情态动词在句子中可发挥不同作用，如表能力，表责任与义务，表推测，表征求允许，表请求，表建议，表语气态度等等● He can/could run 100 meters in 11 seconds.● You should/ought to/must work hard to win a gold medal.● Can/Could/May/Might I watch the Olympics tonight?● Will/Can/Could/Would you help me with my training?● He might/may/could/should/ought to/will/must watch the football match tonight.● I suggest that you should watch the opening ceremony.● Can this be true?4. (1)情态动词+do 表对一般现在或将来情况的推测(2)情态动词+ be doing 表对正在发生的事情的推测(3)情态动词+have done 表对过去已经发生的事情的推测● 常见“情态动词+have done”归纳1. could have done 过去本有能力做某事但没做（虚拟）2. may/might have done ①过去可能已经做了某事（推测）②过去本可能做某事但没做（虚拟）(责备)3. must have done过去一定已经做了某事（推测）4. can't/couldn't have done过去不可能已经做了某事（推测）5. should/ ought to have done ①过去应该已经做了某事（推测）②过去本应该做某事但没做（虚拟）（责备）6. shouldn't/ oughtn't to have done 过去本不应该做某事但做了（虚拟）（责备）7. needn't have done 过去本不必做某事但做了（虚拟）例句1) You could have got a full mark, but you were to careless.2) She may have missed the first train in the morning.3) You may have hurt yourself when climbing the tree.4) You must have stayed up late last night.5) It can't/couldn't have rained last night, for the streets are dry.6) They should have arrived in Beijing by this time.7) You should have e to the meeting earlier.8) You shouldn't have told Mary the sad truth.9) You needn't have taken a taxi here, for it was near my house.一、can/could 的用法3. 固定用法：(1) can not/never…too/enough “再怎么…也不过分，越…越好”● I can never thank you enough.● You can't be too careful.● You can never remember too many words.(2) can't + 比较级“不能更...，非常...”● I can't agree more.● The film couldn't be more boring(3) cannot but do sth. 不得不，只好● I cannot but admire your bravery.(4) can't help doing sth 情不自禁做； can't help (to) do sth 不能帮忙做二、may/might的用法3．may表示祝愿或希望。
高中英语知识点归纳情态动词和过去进行时的否定和疑问句总结
高中英语知识点归纳情态动词和过去进行时的否定和疑问句总结情态动词和过去进行时的否定和疑问句是高中英语中的重要知识点，掌握了这些内容可以帮助学生更好地理解和运用英语语法。
本文将对情态动词以及过去进行时的否定和疑问句进行归纳总结。
一、情态动词(Modal Verbs)情态动词是用来表示说话人对某种行为或状态的态度、能力、建议、意愿、可能性等的动词。
情态动词一般没有人称和数的变化。
常见的情态动词包括can, could, may, might, shall, should, will, would, must等。
1. 能力和能力推测情态动词can表示某人具备某种能力或技能，例如：- She can swim.（她会游泳。
）情态动词could表示过去某人具备某种能力或技能，例如：- When he was young, he could speak five languages.（他年轻的时候会说五种语言。
）情态动词may和might表示某人具备某种可能性，例如：- It may rain tomorrow.（明天可能下雨。
）- He might be late for the meeting.（他可能会迟到会议。
）2. 请求和允许情态动词can和could可用于请求或征询意见，例如：- Can you help me with my homework?（你能帮我做作业吗？）情态动词may和might也可用于请求，但较为正式和客气，例如：- May I ask you a question?（我可以问你一个问题吗？）情态动词can和may还可以用于表示允许，例如：- You can go home now.（你现在可以回家了。
）- May I use your phone?（我可以用一下你的手机吗？）3. 推测和推测的过去形式情态动词must表示对某种情况的推测，认为某事发生是非常有可能的，例如：- He must be tired.（他一定很累。
高中英语语法——情态动词总结(附带练习)
情态动词总结I 情态动词的特征：1.本身有词义。
2.不能独立作谓语。
2. 后接动词原形一起构成谓语。
3. 不随人称和数的变化。
II 情态动词各自的基本意义及用法：1.大多数情态动词（除表‘能力、许可、意志’外），都可以表示推测，其程度有差异。
按可能性程度的高低排列为：must﹥will ﹥would ﹥ought to ﹥should完全肯定完全可能很可能﹥can ﹥could﹥may ﹥might可能有可能2. 区分情态动词的否定含义：may not或许不、可能不might not可能不can’t 不可能mustn’t不许、禁止shouldn’t不应该needn’t 不必1.情态动词表推测的反意疑问句，简单来说，就是以情态动词后的时态为淮，如句子里有明确的时间状语，则以其为准。
2.以must 为例：E.g. 1. You must be hungry now, aren’t you?2. He must be watching TV , isn’t he ?3 Tom must have lived her for a long time, hasn’t he ?4. She must have arrived yesterday, didn’t she?注：如选择题中（以She must have arrived yesterday, didn’t she？为例）既有didn’t she又有hasn’t she则以didn’t she？为最佳答案。
IV 情态动词专项练习与解析一( ) 1. You _____ return the book now. You can keep it till next week if you like.A. can’tB. mustn’tC. needn’tD. may not( ) 2. Where is my pen? I _____ it.A. might loseB. would have lostC. should have lostD. must have lost( ) 3. I wish I _____ you yesterday.A. seenB. did seeC. had seenD. were to see( ) 4. I didn’t hear the phone. I _____ asleep.A. must beB. must have beenC. should beD. should have been( ) 5. If my lawyer _____ here last Saturday, he _____ me from going.A. had been; would have preventedB. had been; would preventC. were; would preventD. were; would have prevented( ) 6. He _____ you more help, even though he was very busy.A. might have givenB. might haveC. may have givenD. may give( ) 7. If it _____ for the snow, we _____ the mountain yesterday.A. were not; could have climbedB. were not; could climbC. had not been; could have climbedD. had not been; could climb( ) 8. Without electricity human life _____ quite difficult today.A. isB. will beC. would have beenD. would be( ) 9. A computer _____ think for itself, it must be told what to do.A. can’tB. couldn’tC. may notD. might not( ) 10. Jenny _____ have kept her word. I wonder why she changed her mind.A. mustB. shouldC. needD. would( )11. We _____ last night, but we went to the concert instead.A. must have studiedB. might studyC. should have studiedD. would study( ) 12. — Could I borrow your dictionary?— Yes, of course you _____.A. mightB. willC. canD. should( ) 13. Tom ought not to _____ me your secret, but he meant no harm.A. have toldB. tellC. be tellingD. having told ( ) 14. — If he _____, he _____ that food.— Luckily he was sent to the hospital immediately.A. was warned; would not takeB. had been warned; would not have takenC. would be warned; had not takenD. would have been warned; had not taken ( ) 15. Peter _____ come with us tonig ht, but he isn’t very sure yet.A. mustB. mayC. canD. will( ) 16. I told Sally how to get here, but perhaps I _____ for her.A. had to write it outB. must have written it outC. should have written it outD. ought to write it out( ) 17. I didn’t see your sister at the meeting. If she _____, she would have met my brother.A. has comeB. did comeC. cameD. had come ( ) 18. — Shall I tell John about it?—No, you _____. I’ve told him already.A. needn’tB. wouldn’tC. mustn’tD. shouldn’t ( ) 19. When a pencil is partly in a glass of water, it looks as if it _____.A. breaksB. has brokenC. were brokenD. had been broken( ) 20. It’s nearly seven o’clock. Jack _____ be here at any moment.A. mustB. needC. shouldD. can( ) 21.— There were already five people in the car but they managed to take me as well.— It _____ a comfortable journey.A. can’t beB. shouldn’t beC. mustn’t have beenD. couldn’t have been ( ) 22. Johnny, you _____ play with the knife, you _____ hurt yourself.A. won’t; can’tB. mustn’t; mayC. shouldn’t; mustD. can’t; shouldn’t ( ) 23. The fire spread through the hotel very quickly but everyone _____ get out.A. had toB. wouldC. couldD. was able to ( ) 24. — When can I come for the photos? I need them tomorrow afternoon.— They _____ be ready by 12:00.A. canB. shouldC. mightD. need( ) 25. — I stayed at a hotel while in New York.— Oh, did you? You _____ with Barbara.A. could have stayedB. could stayC. would stayD. must have stayed ( ) 26. — Will you stay for lunch?— Sorry, _____. My brother is coming to see me.A. I mustn’tB. I can’tC. I needn’tD. I won’t( ) 27. — Are you coming to Jeff’s party?—I’m not sure. I _____ go to the concert instead.A. mustB. wouldC. shouldD. might( ) 28. — Write to me when you get home.— _____.A. I mustB. I shouldC. I willD. I can( ) 29. I was really anxious about you, you _____ home without a word.A. mustn’t leaveB. shouldn’t have leftC. couldn’t have leftD. needn’t leave( ) 30. — Is John coming by train?— He should, but he _____ not. He likes driving his car.A. mustB. canC. needD. may专项练习（二）1. I didn’t see her in the meeting room this morning. She _____ at the meeting.A. mustn’t have spokenB. shouldn’t have spokenC. needn’t have spokenD. couldn’t have spoken2. One ought _____ for what one hasn’t done.A. not to be punishedB. to not be punishedC. to not punishedD. not be punished3. If you really want yourself to be in good health, you must ___ always ___ so much.A. not; be smokingB. not; have smokedC. not; to smokeD. be not; smoking4. With so much work on hand, you _____ to see the game last night.A. mustn’t goB. shouldn’t goC. couldn’t have goneD. shouldn’t have gone5. Most of the students felt rather disappointed at the English party. They say that it ______ better organized.A. had beenB. had to beC. must have beenD. could have been6. I’m surprised that he _____ in the exam.A. should failB. would have failedC. may have failedD. should have failed7. The little girl _____ there alone.A. not dare goB. dares not goC. dare not goD. dare not to go8. “Must we do it now?” “No, you _____.”A. won’tB. needn’tC. can’tD. don’t9. He said he would rather not _____ it right now.A. doingB. to doC. doD. to be doing10. You _____ to the meeting this afternoon if you have something important to do.A. needn’t to comeB. don’t need comeC. don’t need comingD. needn’t come11. Put on more clothes. You _____ be feeling cold with only a shirt on.A. canB. couldC. wouldD. must12. I _____ play football than baseball.A. would ratherB. had betterC. like betterD. prefer13. I thought you _____ like something to read, so I have brought you some books.A. mayB. mightC. couldD. must14. There was plenty of times. She _____.A. mustn’t have hurriedB. couldn’t have hurriedC. must not hurryD. needn’t have hurried15. The plant is dead. I _____ it more water.A. will giveB. would have givenC. must giveD. should have given16. You _____ return the book now. You can keep it till next week if you like.A. can’tB. mustn’tC. needn’tD. may not17. It’s still early, you _____.A. mustn’t hurryB. wouldn’t hurryC. may not hurryD. don’t have to hurry18. Please open the window, _____?A. can’t youB. aren’t youC. do youD. will you19. We _____ for her because she never came.A. mustn’t have waitedB. shouldn’t have waitedC. mustn’t waitD. needn’t wait20. — May I stop here? — No, you _____.A. mustn’tB. might notC. needn’tD. won’t21. It’s a fine day. Let’s go fishing, _____.A. won’t weB. will weC. don’t weD. shall we22. I didn’t see her in the meeting room this morning. She _____ at the meeting.A. mustn’t have spokenB. shouldn’t have spokenC. needn’t have spokenD. couldn’t have spoken23. — Please don’t make a noise. — _____. I’ll be as quiet as a mouse.A. Yes, I won’tB. No, I won’tC. No, I willD. Yes, I will24. The young man has made so much noise that he _____ not have been allowed to attend the concert.A. couldB. mustC. wouldD. should25. — Where is John? — He _____ in the library.A. should beB. must beC. can beD. must have been26. Since the road is wet this morning, _____ last night.A. it must rainB. it must be rainingC. it must have rainedD. it must have been rain27. — Will your brother stay home tonight?— I’m not quite sure. He _____ to the cinema tonight.A. must goB. can goC. may goD. may be going28. She’s already two hours late. What ______ to her?A. can have happenedB. may have happenedC. should have happenedD. must happen29. You must be a writer, _____?A. mustn’t youB. are youC. must youD. aren’t you30. I got up early that morning, but I _____ so because I had no work to do.A. mustn’t have doneB. didn’t need to doC. needn’t have doneD. can’t have done31. He _____ have come here yesterday, but he didn’t.A. couldB. shouldC. ought toD. all the above32. I missed the last bus, so I _____ go home on foot.A. mustB. have toC. mayD. had to33. He ought to win the first prize, _____ he?A. oughtn’tB. shouldn’tC. mustn’tD. both A and B34. Everyone _____ do his best for the modernizations of our country.A. canB. mayC. shouldD. might35. Let’s clean our classroom, _____?A. will youB. don’t weC. shall weD. do you36. Let us play basketball, ______?A. will youB. don’t weC. shall weD. do you37. He asked me for this book many times. Please tell him that he _____ have it tomorrow.A. mustB. mayC. shallD. both B and C38. “Your phone number again? I _____ quite catch it.” “It’s 9568442.”A. didn’tB. couldn’tC. don’tD. can’t39. Mother _____ us stories when we were children.A. was used to tellB. is used to tellingC. used to tellD. used to telling40. She would rather _____ more money on books _____ on clothes.A. cos t … notB. to spare … don’tC. pay … thanD. spend … than专项练习（三）1. — Has Li Lin started? He said he would join in the party.— He ______. He is a man of keeping his word.A. could have leftB. must have leftC. can’t comeD. won’t be c oming2. — May I park my car here?— No, you ______. No car is allowed to park here.A. may notB. needn’tC. mustn’tD. daren’t3. — Excuse me, could you tell me where the Yajia Supermarket is?—It’s two blocks straight ahead. You ______ miss it.A. mustn’tB. can’tC. needn’tD. shouldn’t4. — I saw Mr. Sun at Tongyu Station this morning.—You ______. He’s still on holiday in Hawaii.A. couldn’t haveB. mustn’t haveC. shouldn’tD. needn’t5. — How about paying a visit to Dr. Wang, our former Chinese teacher?— Good idea. I will e-mail him today so that he ______ know ______ to expect us.A. shall; whyB. could; whenC. would; whatD. will; how6. Everything has two sides. Beautiful songs, sometimes, ______ be just noise to others.A. mustB. mayC. shouldD. could7. Someone ______ my umbrella. I found it wet yesterday.A. must be usingB. must have usedC. must useD. must have been using8. — How dangerous it was!— Yes, but for the passer-by’s quick action, th e girl ______.A. was drownedB. could have been drownedC. had drownedD. should be drowned9. You ______ scold such a pupil who always keeps silent so seriously that you ______ hurt him.A. should; canB. may; willC. mustn’t; mayD. can’t; must10. — Why does Alice know so much about Angkor Wat?— She ______ have been there, or ...A. mustB. oughtn’t toC. mayD. can’t11. —You may laugh, but I’ve been thinking of becoming a vegetarian.— Oh, you ______ be crazy. You will be hungry all the time.A. mustB. mayC. willD. need12. —What’s the matter with you?—Oh, I’m not feeling well in the stomach. I ______ so much fried fish just now.A. shouldn’t eatB. mustn’t have eatenC. shouldn’t have eatenD. mus tn’t eat13. — ______ he have been chosen as captain of the football team?— Yes, he ______.A. Can; must haveB. Must; must haveC. Can; mustD. Must; must14. Mr. Zhang ______ in Shanghai tomorrow morning.A. can have arrivedB. will have arrivedC. may have arrivedD. must have arrived15. Miss Wang started at 8 o’clock, and she ______ be there now.A. shouldB. canC. can’tD. need16. — It must be Mr. Li who did it. — No, it ______ be Mr. Li.A. mustn’tB. wouldn’tC. can’tD. may17. You ______ finish reading the book as soon as possible.A. mayB. canC. needD. should18. — Need you go to work now? — Yes, I ______.A. mustB. needC. canD. dare19. Your trousers are dirty. ______ them for you?A. Shall I washB. Will I washC. Am I going to washD. Am I washing情态动词专项练习与解析一【练习解析】1．C 从原题中You can keep it till next week if you like这一信息句可知，“你不必现在还”。
高中英语情态动词用法和虚拟语气语法知识
高中英语情态动词用法和虚拟语气语法知识一、can和could1、can的用法（1）表示体力和脑力方面的能力。
（2）表示对现在的动作或状态进行主观的猜测，主要用在否定句和疑问句中。
（3）表示可能性，理论上的可能性，意为“有时候可能会”，可用于肯定句。
（4）表示允许，意思与may接近。
（5）表示说话人的推测、怀疑、惊异、猜测或不肯定等，主要用于否定句、疑问句或感叹句中。
（6）can的特殊句型cannot…too / enough表示“无论怎么。
也不过分”。
“越……越好”。
cannot but+ do sth.表示“不得不，只好”。
2、could的用法（1）表示能力，指的是过去时间。
（2）表示允许，指的是过去时间。
（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。
（4）委婉客气地提出问题或陈述看法，指的是现在时间。
主要用于疑问句，回答时用can。
3、can与could的区别can表推测时只用于否定句和疑问句（could无此限制）。
couldn't的可能性比can't小。
4、can与be able to的区别（1）现在时：无区别，但后者不常用。
（2）完成时;can没有完成时，此时要用have（has,had）been able to。
（3）将来时：can没有将来时，要用will be able to。
（4）过去时：could表示一般能力，was/were able to 表示在具体场合通过努力成功做成某事的能力。
二、may 和might1、may的用法（1）表示询问或说明一件事可不可以做。
（2）表示一件事或许会发生或某种情况可能会存在，通常用在肯定句和否定句中。
注意：表示可能性时，can't语气强，表示“不可能”，may not语气弱，表示“可能不”。
2、might的用法（1）表示询问或允许，指的是过去时间。
（2）表示可能发生的事，可以指过去时间，也可以指现在时间，语气更加不肯定，可能性比may小一些。
高中英语语法：情态动词的详解大总结
高中英语语法：情态动词的详解大总结一、can和could1、can的用法（1）表示体力和脑力方面的能力。
（2）表示对现在的动作或状态进行主观的猜测，主要用在否定句和疑问句中。
（3）表示可能性，理论上的可能性，意为“有时候可能会”，可用于肯定句。
（4）表示允许，意思与may接近。
（5）表示说话人的推测、怀疑、惊异、猜测或不肯定等，主要用于否定句、疑问句或感叹句中。
（6）can的特殊句型cannot…too / enough表示“无论怎么...也不过分”“越...越好”cannot but+ do sth.表示“不得不，只好”2、could的用法（1）表示能力，指的是过去时间。
（2）表示允许，指的是过去时间。
（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。
（4）委婉客气地提出问题或陈述看法，指的是现在时间。
主要用于疑问句，回答时用can。
3、can与could的区别can表推测时只用于否定句和疑问句（could无此限制）。
couldn’t的可能性比can’t小。
4、can与be able to的区别（1）现在时：无区别，但后者不常用。
（2）完成时;can没有完成时，此时要用have （has,had）been able to。
（3）将来时：can没有将来时，要用will be able to。
（4）过去时：could表示一般能力，was/were able to 表示在具体场合通过努力成功做成某事的能力。
二、may 和might1、may的用法（1）表示询问或说明一件事可不可以做。
（2）表示一件事或许会发生或某种情况可能会存在，通常用在肯定句和否定句中。
注意：表示可能性时，can’t语气强，表示“不可能”，may not语气弱，表示“可能不”。
2、might的用法（1）表示询问或允许，指的是过去时间。
（2）表示可能发生的事，可以指过去时间，也可以指现在时间，语气更加不肯定，可能性比may小一些。
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高中英语知识点：情态动词 情态动词的概念： 情态动词表示说话人对某一动作或状态的态度。 几组词的辨析： 1、need和dare的用法： need和dare既可用作情态动词，也可用作实义动词。用作情态动词时，主要用于否定句和疑问句。用作实义动词时，可用于各种句式。 （1）用作情态动词： 如：—Need I come? 我需要来吗？ —Yes, you must. 需要。 You needn′t telephone him now. 你现在不必打电话给他。 I don′t think you need worry. 我想你不必发愁。 She dare not go out alone at night. 她晚上不敢一个人出去。 How dare you say I′m unfair? 你竟敢说我不公平？ Not one of them dared mention this.他们谁也不敢提这件事。 （2）用作实义动词： 如：You don′t need to do it yourself. 你不必亲自做这件事。 We need to tell them the news. 我们需要把这消息告诉他们。 The table needs painting(to be painted.). 桌子需要油漆一下。 We should dare to give our own opinion.我们要敢于提出自己的观点。 He did not dare(to) look up. 他不敢抬头看。 I dare day he′ll come again. 我想他会再来的。 2、can和be able to： （1）情态动词can只有两种时态形式，现在式can和过去式could，而be able to有多种时态形式。 如：Mary can play the piano. She has been able to play it since she was 5. 玛丽会弹钢琴。她五岁起就会弹了。 （2）用在过去时中，could经常表示能够做某事，事实上不一定去做，而was∕were able to则表示“过去做成了某事”。在否定句中两者可通用。 如：He could swim across the English Channel. But he didn′t feel like it that day. 他能游过英吉利海峡，但那天他不想游。 Yesterday I was able to get home before the heavy rain. 昨天我在下大雨前赶到了家里。 3、must和have to： must表示主观意志，而have to表示由于客观因素不得不做某事。must没有过去式，除在间接引语中可用于表示过去时间，在直接引语中表示过去时间应该用had to代替。 如：I told her that she must give up smoking. 我叫她必须戒烟。 We had to get everything ready that night. 我们那晚得把一切准备就绪。 4、would和used to： （1）usedto表示过去与现在或过去某时与后来的情况有不同，而would只表过去的情况。 如：People used to think that the earth was flat. 过去人们认为地球是平的。（现在人们不这么认为。） She would go out for a walk in the morning when she was in the country. 在乡下时，她总是在早晨去散会儿步。（可能现在仍有散步的习惯。） （2）used to可表示过去的习惯动作和经常的情况，而would只表示过去的习惯动作。 如：He used to∕would smoke while writing. 过去他写东西时常抽烟。 She used to be fat. 她过去很胖。 情态动词的基本用法： 1、can(could)： 1）表示能力，could主要指过去时间。 如：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）。 如：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。 如：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。 如：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。 如：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。 如：You may take what ever 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。 如：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。 如：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）。 如：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。 如：He must be ill. He looks so pale. 他准是病了。他的脸色苍白。 如：She′s wearing a diamond necklace. She must have a lot o fmoney. 她戴着钻石项链，一定很有钱。 4、shall： 1）表征询意见，用于第一、第三人称疑问句。 如：Shall I get you some tea? 我给你点茶好吗？ Shall the boy wait outside? 让那男孩在外面等吗？ What shall we do this evening? 我们今晚做什么？ 2）表说话人的意愿，有“命令、允诺、警告、决心”等意思，用于第二、第三人称陈述句。 如：You shall do as I say. 按我说的做。（命令） You shall have my answer tomorrow. 你明天可以得到我的答复。（允诺） He shall be sorry for it one day, I tell you.有一天他会后悔的，我告诉你。（警告） 如：Nothing shall stop us from carrying out the plan.什么也不能阻止我们执行这项计划。（决心） 5、will： 1）表意愿，用于各种人称陈述句。 如：I will do anything for you. 我愿为你做任何事。 None is so blind as those who won′t see. 不愿看的人眼最瞎。 If you will read the book, I′ll lend it to you. 如果你愿意读这本书，我会把它借给你。 2）表请求，用于疑问句。 如：Will you close the window? It′s a bit cold. 请你把窗户关上好吗？有点冷。 Won′t you drink some more coffee? 再来一点咖啡好吗？ 3）表示某种倾向或习惯性动作。 如：Fish will die out of water. 鱼离开水就不能活。 The door won′t open. 这门打不开。 The boy will sit there hour after hour looking at the traffic go by.