❶ 高中英语情态动词
①只复做情态动词:must,can,may……
②可做制情态动词又可做实义动词：如：need, dare
③具有情态动词特征：have(had,has) to,used to, ought to
④可做情态动词又可作助动词：如：shall(should),will(would)[
注意
mustn't代表强烈禁止 must表示主观，have to表示客观。
美式英语中常用must not 而不用 mustn't. mayn't,mightn't和shan't也很少用
常用
can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would)
❷ 高中英语 情态动词练习
dare作为特殊情态动词，常用于疑问和否定句。无三单过去式变化。后接省略to的不专定式动词属。
dare作为普通实义动词，常用于肯定句。有三单和过去式变化。后接to do不定式动词。
根据句意及dare用法，a和c错误。只有b和d正确。根据时间判断，选b为合适正确答案。
❸ 高中英语语法：情态动词
你好
http://wenku..com/view/a7cf7e630b1c59eef8c7b4e6.html。这个是关于情态动词的详细讲解。高中英语语法简明讲专义,简明列出个语法的注意点,对于应试生而言属是非常有用的语法补习课!
希望对你有帮助。
❹ 高中阶段英语语法“情态动词”以及“非谓语动词”的重点和难点是什么
情态动词
情态动词 (Model Verbs) 又称为情态助动词 (Model Auxil-iaries)。英语中助动词主要有两类：一是基本助动词，如have, do, be；二是情态助动词，如may, must, need等。情态动词与其他动词连用表示说话人的语气。情态动词可表达建议、要求、可能和意愿等。情态动词没有人称和数的变化。在大学英语四、六级考试中，情态动词部分重点测试以下内容：
（1）情态动词+行为动词完成式
（2）情态动词+行为动词进行式
（3）情态动词+行为动词完成进行式
（4）某些情态动词的特殊用法
一、情态动词+行为动词完成式
情态动词+行为动词完成式即“情态动词+ have + v-ed分词”，表示对过去行为或动作进行推测、评论或判断。
1. must have v-ed
must have v-ed 表示推测过去某事“一定”发生了。其否定形式为：can’t / couldn’t have v-ed, 表示过去不可能发生某事。例如：
1）Since the ditch is full of water, it must have rained last night.
2）You couldn’t have met my grandmother. She died before you were born.
2. could have v-ed
could have v-ed 表示推测过去某动作“很可能”发生了。例如：
1）“The dictionary has disappeared. Who could have taken it?”
2）“Tom could have taken it. He was alone yesterday.”
3.may / might have v-ed
may / might have v-ed 表示推测过去某事“也许”发生了.may 比 might 表示的可能性在说话人看来稍大些。例如：
I can’t find my keys. I may / might have left them at the school yesterday.
4. ought to / should have v-ed 和 ought not to / shouldn’t have v-ed
ought to / should have v-ed 和 ought not to / shouldn’t have v-ed 用于对已发生的情况表示“责备”、“不满”，分别表示“本应该…”和“本不应该…”。例如：
1）With all the work finished, I should have gone to the party last night.
2）You ought not to make fun of him. He is not the one you laugh at but learn from.
5. needn’t have v-ed
needn’t have v-ed 表示过去做了某事，但没有做的必要， 意为“本没必要…”。例如：
You needn’t have waken me up; I don’t have to go to work today.
注：表示推测过去某动作发生的可能性时，就表示的可能性程度而言，must最大，could其次，may更次之，might最小。例如：
“I wonder how Tom knew about your past.”
“He must / could / may / might have heard of it from Mary.”
二、情态动词+行为动词进行式
情态动词+行为动词进行式（即情态动词+ be + v-ing形式），表示推测或评论某动作现在是否正在进行。例如：
1）He must be playing basketball in the room.
2）She may be staying at home.
三、情态动词+行为动词完成进行式
情态动词+行为动词完成进行式（即情态动词+ have been + v-ing 形式），表示推测或评论过去某动作是否正在进行或一直在进行。例如：
1）They should have been meeting to discuss the problem.
2）He may / might have been buying stamps in the post office when you saw him.
四、某些情态动词的特殊用法
1. need
考试中主要测试 need 作情态动词与作实义动词的区别，对此，可参见表1.need 作情态动词时，后面跟不带to 的动词不定式，即 “need to”。通常用在疑问句和否定句中，表示询问是否有“必要”，其否定形式为needn’t，表示“不必”；疑问形式为 Need … do? 极少用于肯定句。例如：
1）I don’t think we need turn the light on at that time.
2）Need you ride a bike to school?
情态动词need与实义动词need 在时态、肯定、否定结构上的对比见表1。
2. dare
考试中主要测试dare作情态动词和作实义动词的区别。
情态动词dare 与实义动词dare 在时态、肯定、否定、疑问结构上的对比见表2。
3. can 和 may
考试中主要测试can，may或could，might表示可能性的区别及对may构成的疑问句的回答。
时态 情态动词need 实义动词 need
现 You need (not) do You (don’t) need to do
在
时 He need (not) do He needs (doesn’t need) to do
过 You needed (didn’t need) to do
去
时 He needed (didn’t need) to do
将 You need (not) do You will (not) need to do
来
时 He need (not) do He will (not) need to do
句型 时态 动词
情态动词dare 实义动词 dare
肯定句 现在时 dare to 少用 dare/dares to do
过去时 dare to 少用 dared to do
否定句 现在时 daren’t/dare not do do/does not dare (to) do
过去时 dared not do did not dare (to) do
疑问句 现在时 Dare he do? Do you/Does he dear (to) do?
过去时 Dared he do? Did he dare (to) do
（1）can, could, may, might都可以表示可能性.can, could表示潜在的可能性或理论上或逻辑判断上存在的可能性；而may, might则表示事实上的可能性。此外，can还具有“有能力”的意思，而may与might则不具此意。例如：
1）According to the weather forecast, it may rain tomorrow.
2) Any man with a little sense can see that he is wrong.
（2）May I / we …？这一类疑问句的肯定回答为Yes, please.或Certainly；否定回答为Please don’t.或No, you mustn’t. 例如：
“May we leave now?” “No, you mustn’t. You haven’t finished your home work yet.”
4. can 和 be able to
can 与 be able to 都可以表示能力，但两者在用法上有点差异：can (could)表示主观能力，不表示意愿，它的将来时用will be able to; be able to表示主观意愿，强调要克服困难去做某事。例如：
1）My grandma is over seventy, but she can still read without glasses.
2）He is able to give up his bad habits.
5. must 和 have to
must 和 have to 都可以表示“必须”，但有几点区别：
（1）must 强调“内在的职责”、“义务”，而have to 强调“外界压力”、“不得已而为之”。
（2）have to可用于多种时态，而must一般用于现在时，其过去时与将来时分别由had to与shall / will have to代替。
（3）在回答must引起的问题时，如果是否定的答复，不能用mustn’t，而要用needn’t或don’t have to，因为mustn’t是“一定不要”、“一定不能”的意思。例如：
1）You must come to the classroom before eight.
2）It is raining hard outside, but I have to leave now.
3）“Must we do it now?” “No, you needn’t.”
6. used to +v, be used to +v-ing和be used to +v
（1）used to +v意为“过去常常”，“过去一直”；be used to +v-ing / n（名词）意为“习惯于”；be used to +v意为“被用来（做某事）”。
（2）used to只表示过去，而be used to +v-ing / n可表示现在、过去或将来。例如：
1）He used to smoke. Now he doesn’t.
2）He’s quite used to hard work / working hard.
3）The knife is used to cut bread.
7．用作情态动词的其他短语
would rather, would sooner, would (just) as soon, had rather, had better, had sooner, can not but, may (just) as well等可用作情态动词。例如：
1）The soldier would sooner die than surrender.
2）The brave soldier would as soon die as yield to such an enemy.
3）I’d rather walk than take a bus.
4）If you don’t like to swim, you may just as well stay at home.
注：这些短语后一般直接跟动词原形.would (had) rather, would (had) sooner, would (just) as soon后可跟that 引导的从句，that 常省去，从句要用虚拟语气。对现在和将来的假设用过去时，对过去的假设用过去完成时。例如：
1）I would rather you came on Sunday.
2）I would sooner you hadn’t asked me to speak yesterday.
非谓语动词
语法讲座
非谓语动词是高中语法的重点，也是难点，学生常常对此感到头疼。其实只要理解并掌握非谓语动词各种形式的特点，做起题来会很轻松。我们先来看看非谓语动词的各种变化形式。熟悉知道了非谓语动词形式后，做题时可分四步分析。
一、分析句子结构
1. ________many times , but he still couldn't understand it .
2. ________many times , he still couldn't understand it .
A. Having been told . B. Told
C. He was told D. Though he had been told
3. ________to the left , you'll find the post office .
4. If you ________to the left , you'll find the post office .
5. ________to the left , and you'll find the post office .
A. Turning B. To turn C. Turn D. Turned
分析：句1. 用连词but 引导并列句子，因此，前面也是个独立句子成分，故选C。
句2. 句中用逗号隔开，且无连词引导，因此，前面不是句子结构，只是句子的一个成分，故选A，用非谓语动词作状语。
句3. 同句2，选A 。
句4. 前面用if 引导从句，故选C ，构成从句谓语。
句5. 同句1，选C。
二、分析逻辑主语
确定要选非谓语动词之后，第二步要分析其逻辑主语。非谓语动词虽不能作谓语，但仍具有动词特点，其逻辑上的动作执行者就叫做逻辑主语。非谓语动词作状语时，其逻辑主语须和句子的真正主语一致。若不一致，则须加上自己的逻辑主语。
1. ________no buses , we have to walk home .
A. There being B. It were C. There were D. It being
2. ______Sunday I shall have a quiet day at home .
分析：句1. 表示“没有公共汽车”，应用“there be”结构，即逻辑主语是“there”，故选A 。
句2. 同理选D。
三、分析语态
分析语态就是在确定逻辑主语之后，分析非谓语动词和逻辑主语在搭配使用时是主动还是被动关系。
1. ______from space , the earth looks blue .
2.______from space , we can see the earth is blue .
A. Seen B. Seeing C. To see D.See
这两个题选项中的非谓语动词都没有加自己的逻辑主语, 因此其逻辑主语就是句子的主语。
分析：句1. “地球”被“看起来”，表被动，故选A，用过去分词表被动。
句2. 我们“主动看……”即表主动，故选B。
3. The dirty clothes ______ , the girl hung them up outside .
4. ______ the dirty clothes ,the girl hung them up outside .
A. was washed B. washed C.were washed D.having washed
分析：句3. 前面应用非谓语动词作句子的状语，逻辑主语是“the dirty clothes”，和动词搭配表示“衣服被洗”，故选B。
句4. 逻辑主语为句子的主语“the girl”，表示“女孩洗衣服”，为主动关系，故选D。
四、分析时态，在选定了主动或被动后，还要考虑动作发生的时间问题，即时态。
1. The building ______now will be a restaurant .
2. The building ______next year will be a restaurant .
3. The building ______last year is a restaurant.
A. having been built B.to be built
C.being built D. built
句1中 now 说明大楼正在被修，故用进行式，选C。
句2中next year 说明大楼将在明年被修，故用表将来的不定式，选B。
句3中 last year 说明大楼已被修，但不能选，因为现在分词的完成式不能作定语，故用过去分词，选D。
又如：
1. He stood there______for his mother .
2. ______for two hours , he went away .
A. waiting B. to wait C. waited D.Having waited
句1表示“站在那等”，两个动词同时发生，故选A作伴随状语。
句2表示已经等了两个小时，发生在谓语动词“went away ”之前，故用完成式，选D 。
需要注意的是，非谓语动词的否定也是常考的项目，要认清否定形式，非谓语动词的否定都应将not 放在前面。
如：
What is the reason for ______there ?
A. not your going B. not your go
C. your not going D. you not to go
巩固练习:
1. ______won't be of much help .(A)
A .Tom's going B. Tom going C. Tom to go D. Tom goes
2. They managed _____the meeting room before the guests arrived. (C)
A. finishing to clean B. finishing cleaning
C. to finish cleaning D. to finish to clean
3. We must find a room big enough _____.(B)
A. for all of us to live B. for all of us to live in
C. to live in all of us D. of all of us to live
4. _____a teacher , I should set a good example to students . (A)
A. Being B. Having been C. To be D. As I being
5. _____a teacher ,one must first be their pupil . (C)
A. Being B. Having been
C. To be D. To have been
6. It was stupid _____ your advice. (C)
A. for me not to take B. for me not taking
C. of me not to take D. of me not taking
7. The teacher told him to speak louder _____by , everybody. (A)
A. so as to be heard B. so as to hear
C. in order that heard D. in order to hear
8. They suggested _____ the sports meet till next Tuesday. (B)
A. us to put off B. our putting off
C. us of putting off D. our put off
9. The doctor gave me some medicine , _____ three times a day before meals. (C)
A. to take B. to be taking C. to be taken D. I took it
10. Thanking them for their kindness , he said that the old lady really appreciated _____by them. (D)
A. visiting B. visited
C. to be visited D. being visited
11. _____made her parents very angry . (B)
A. Jane's engaging Black B. Jane's being engaged to Black
C. Jane having engaged to Black D. Jane has engaged to Black
12. Don't you think it any good_____in public places? (B)
A. forbidding smoking B. to forbid smoking
C. to forbid to smoke D. forbidding to smoke
13. China is a _____ country and we should introce _____ science and technology from the _____ countries. (B)
A. developed; advanced; developed B. developing;advanced;developed
C. developing;advancing;developing D. developed; advancing ; developing
14. _____, the work can be done much better . (C)
A. Given more time B.We had been given more time
C. More time given D. If more time had given
15. _____from space , the earth , with water _____seventy percent of its surface , looks like a "blue ball". (D)
A. Seen ; covered B. Seeing ; covering
C. Seeing; covered D. Seen; covering
16. People always shake hands with each other when _____. (C)
A. to introce B. introce C. introced D. introcing
17. _____, tears ran down her pale face. (A)
A. No word said B. Say no word
C. Not saying a word D. Without saying a word
18. Tigers _____ meat -eating animals , _____meat . (A)
A. belonged to ;fed on B. belonging to ; feed on
C. were belonged to ; feed on D. belonging to ; feeding on
19. We must take measures to prevent our earth _____. (C)
A. to be polluted B. from polluting
C. from being polluted D. from polluted
20. As the stone was too heavy to move , I left it _____ on the ground . (C)
A. laying B. lay C. lying D. lain.
❺ 高中英语常见的情态动词且它们的意思
情态动词
★基本概念和用法：
情态动词是一类本身具有一定词义的动词，但没有人称和数的变化，也不能单独使用，它必须要和其他动词连用作句子的谓语。情态动词可表示语气、建议、要求、可能和意愿等。常用的情态动词有：can, could, may, might, must, shall, should, will, would, ought to, need, dare等。
★情态动词的基本用法
1. can (could) 表能力、允许、(从理论上或逻辑上判断）可能性以及表惊异、怀疑、不相信等态度（主要用于否定句、疑问句或感叹句中）。could指过去或表示语气委婉。例如：
The boy can speak three languages.这个孩子能说三种语言.
Can I borrow the book from the library?我能从图书馆里借书吗？
I could swim when I was eight.我八岁的时候就能游泳。
2. may (might) 表允许、可能性、祝愿等。might可以指过去，也可指现在，语气更委婉。例如：
May (Might) I ask for a photo of your baby?我可以要一张你孩子的照片吗？
She may be still waiting for us.她也许还在等我们呢。
May you have a happy holiday!祝你假期愉快！
3. will (would) 表意愿(用于各种人称的陈述句)、请求(用于疑问句)、某种倾向或习惯性动作等。would指过去或表示语气委婉。例如：
Will you come this way, please?请这边来。
Would you please close the window?请你关好窗子好吗？
Fish will die without water.鱼离开水会死。
Every time she was in trouble, she would go to him for help.每当她遇到麻烦，她都会找他帮忙。
4. must 表命令、推测（现在、过去或将来的猜测）、偏偏等含义。例如：
We must do everything step by step.你必须按部就班的做事情。
He must be ill. He looks so pale.他一定是病了，脸色看起啦这么苍白。
It can’t help. He must go with me.这不管用，他必须跟我走。
5. shall 用于第一、三人称疑问句中表示请求或征求对方意见; 用于第二、三人称陈述句中表示允诺、命令、警告、威胁、决心等。例如：
Shall I get you a cup of coffee?要我给你杯咖啡吗？
You shall have my answer tomorrow.明天你就能得到我的答复。
He shall be sorry for it one day, I tell you.我告诉你，他总有一天会为此后悔。
6. should / ought to 表义务（因责任、义务等该做）、推测、建议等。ought to 的口气比should稍重。例如：
You should be polite to your teachers.你应该对老师有礼貌。
You are his father so you ought to take care of him.你是他的父亲，因此你应该照顾他。
★情态动词的回答
疑问式
肯定回答
否定回答
Could I…?
Yes, you can.
Yes, go ahead.
No, you can’t.
Must I…?
Yes, you must.
No, you needn’t / don’t have to.
May I …?
Yes, of course.
Yes, please.
Yes, go ahead.
No, you mustn’t.
No, you can’t.
Will you ...?
Would you…?
Certainly. / Sure. / All right.
I’m sorry. I can’t.
No, thank you.
No, I won’t.
★辨析
1. can (could) 与be able to
can表示“能力”时，和be able to相当，许多场合都可以互换。但当叙述过去经过一番努力才能完成的事情或前面有特殊说明时，只能用be able to，且be able to可以用于各种时态。例如：
I can / am able to stand on my head.我能倒立。
I’m sorry I haven’t been able to answer your letter in time.非常抱歉我没有能够及时回答你的问题。
2. must与have to
must与have to都含有“必须”之意，must含有说话者的强烈决心 (表示主观的看法)，have to则表示外部因素或习惯使然 (即表示客观的必要，作“不得不”解)，且have to 有更多的时态形式。例如：
He said that he must work hard. （主观） 他说他必须努力学习。
My brother was very ill, so I had to call the doctor in the middle of the night. (客观) 妈妈病了，因此我不得不在半夜里叫医生。
We’ll have to help them as much as we can.我们将不得不尽力帮助他们。
3. would 与used to
would表示过去的习惯性动作时，只表示过去的情况，与现在无关，往往要带有一个特定的时间状语；used to可表示过去的习惯动作或状态，强调“现在已无此习惯”。例如：
Whenever we were in the country, we would play hide-and-seek in the fields. 无论什么时候我们在乡下，我们都会玩捉迷藏。
We used to play hide-and-seek in the fields.我们过去常在野外玩捉迷藏。
★ 情态动词+ have +过去分词
1) may(might) have + done sth, can (could) have + done sth.表示过去，推测过去时间里可能发生的事情。
Philip may (might) have been hurt seriously in the car accident. 菲利普也许在车祸中严重受伤的。
2)must have +done sth.，对过去时间里可能发生的事情的推测，语气较强，具有“肯定”的意思。
--- Linda has gone to work, but her bicycle is still here.琳达已经去工作了，但是她的自行车还在这里。
---She must have gone by bus.她一定是坐公车去的。
3) ought to have done sth., should have done sth. 本应该做某事，而事实上并没有做。否定句表示"不该做某事而做了"。
You ought to (should) have been more careful in this experiment.你在实验中本该更认真一点的。
He ought not to have thrown the old clothes away.你本不该旧衣服扔掉的。（事实上已扔了。）
注意：ought to 在语气上比should 要强。
4) needn’t have done sth 本没必要做某事
I dressed very warmly for the trip, but I needn’t have done so. The weather was hot.我穿的很暖和去度假，但是我没有必要这样穿，天气太热了。
❻ 高中英语情态动词题
答案：3 should
翻译：这位衣着时髦的女士在时装店里面盗窃时被逮个正着。专说来也奇怪，她属竟然/居然会做这么一件事。
解释：
should有一个特殊用法，意思是“居然/竟然”，表示说话人不相信或怀疑的语气。
此题从前后文中的well-dressed lady可以看出此含义。
如果你满意我的答案，敬请点击“选为满意回答”，谢谢！
❼ 高中英语 情态动词表推断的时候怎么区别
你好这些情态动词的用法如下：
一、can的用法：
1. (表示能力、功能)能,会
The classroom can seat thirty students.
这教室能坐三十位学生。
June can drive now.
琼现在会开车了。
2. (表示可能性)可能,可能会
I think the work can be completed ahead of time.
我认为这项工作能提前完成。
3. (表示允许、请求)可以
You can't take the book out of the room.
你不可以将这本书拿出室外。
Can I use your pen?
我可以用一下你的笔吗?
4. (表示命令)必须
If you won't keep quiet you can get out.
你如不保持安静,就请你走。
5. (表示偶然发生的可能性)有时会
It can be quite windy there, especially in spring.
那里有时容易刮风,特别在春季。
6. (表示惊讶)究竟;竟至于
What can it possibly be?
到底那是怎么一回事?
二、could的用法
can的过去式；
（用于虚拟语气，表示与事实相反的设想）能；可以；
（表示可能性）可能；
（用于婉转语气）能，可以
三、may的用法
1.表示请求和允许，意思是：可以
He may come if he likes. 如果他想来，可以来
2.表示祝愿，意思是：祝…，（但愿）。
May the friendship between our two peoples last forever. 祝两国人民的友谊万古长青。
3.表示推测，意思是：可能（会），或许（会）。
It may rain this evening. You'd better take an umbrella. 今晚可能要下雨，你最好带上雨伞。
四、must的用法
1.表“必须”。
You must talk to them about their study.你必须同他们谈谈关于他们学习的事。
2.在否定结构中表不许。
You mustn't leave here.你不能离开这儿。
3.表坚定的建议。
You must come and see us as soon as you get to Shanghai.一到上海你得马上来看我们。
4.表推测，暗含有很大的可能性，用在肯定句。
He must be ill. He looks so pale.他肯定是病了。他的脸色那么苍白。
注意：
may 暗含的可能性较小。must 暗含的可能性较大。否定的猜测用can't
The baby can't be ill. He is so active.那宝宝不大可能是病了。他那么活跃。
五、might的用法
might表示的可能性太小，没有足够的说服力去职责别人。
can, could 之间的区别，和 may,might 之间的区别在于，虚拟句和过去时态用后者,表示的可能性比原词小，但大部分时候2者可以互换，不会产生歧义或者对表述造成干扰。
六、should的用法
1.should 作为助动词 shall 的过去式，可以在间接引语中与第一人称主语搭配，表示过去将来时间。
2.should 作为情态动词，通常用来表示现在或将来的责任或义务，译作“应该”、“应当”，这时它可以和 ought to， be supposed to 互换使用。例如：
You should （= are supposed to ） complete your test in time.
你们应该按时做完你们的实验。
3.should 作为情态动词，可以用在条件状语从句中，表示语气较强的假设，译作“万一”、“竟然”，这时也可将 should 置于从句之首，即将 should 放在主语前面，而省略从属连词 if
例如：If it should rain tomorrow， I wouldn't go. （= Should it rain tomorrow，I wouldn't go.）
万一明天天下雨，我就不去了。
七、 would的用法
1.would是will的过去式，Would you like～？
表示请求、劝说，是很客气的说法。
Would you like a cup of tea？
您愿意喝杯茶吗？
2.主语+would like to～
表示“想要……”的意思上，与…want to～意思一 样，但用此句型较客气。
I want to ask you a question.
最基本的虚拟语气句型:
主句用would/ should/ could/ might +动词原形。
❽ 急求高中英语情态动词所有知识点及讲解
知识精要
情态助动词是近几年来高考的重点考查项目。对情态助动词的考查主要围绕其推测和可能性的用法而展开。此外，对个别助动词的特殊用法要熟练掌握。
1.表示能力，意为“能，会”，用can, could, be able to均可，could是can的过去式。区别是：can只有过去时could，而be able to有多种时态。
John can speak three foreign languages fluently.
约翰能流利地说三门外语。
John could swim when he was four.
约翰四岁时就会游泳。
I regretted that I hadn’t been able to drive him home.
我后悔我没能开车送他回家。
Will you be able to help me learn English tomorrow?
明天你能帮助我学习英语吗？
2.表示请求或允许，意为“可以”时，用can、could或may均可，只不过can比may更正式，could比can语气更委婉。
Can I park my car in front of your office?
我能把我的车停在你的办公室前面吗？
----Could I use your bike now?
----Certainly. Go ahead.
May I have a look at the photos that you took yesterday?
我能看一下你昨天拍的照片吗？
3. must, can, may/might表推测时的用法。
表推测时must用于肯定句，can用于疑问句和否定句，may/might用于肯定句和否定句。must用于否定句时不表推测，表示“禁止，千万不做…”。
The man standing over there must be a doctor.
站在那边的那个男子一定是个医生。
The man standing over there can’t be a doctor.
站在那边的那个男子不可能是个医生。
He may be out now.
他可能出去了。
I think you mustn’t change the way that you live.
我想你千万不要改变你的生活方式。（这句中的must不表推测，表禁止。）
can和may表推测都可用于否定句，但can’t的意思是“不可能”，may not的意思是“可能不”。可见can’t的否定意味更强。
A teacher like her may not be popular with the students.
像她这样的老师可能不会受到学生的欢迎。
A teacher like her can not be popular with the students.
像她这样的老师不可能会受到学生的欢迎。
4.can和may都可以用于肯定句中表示可能性，注意它们的的区别。
can表示可能性时是“理论上的（或逻辑上的）可能性”，并不是说话人的主观猜测，意为“有时会…”。may表示的是“现实的可能性”。
In the north of Canada it can snow in June.
在加拿大的北部六月份有时会下雪。
The road is narrow and it can be blocked sometimes.
这条路窄，有时会堵车。
Jane has promised she will be here at 8:30,but it is 9:00 now and she hasn’t turned up. The road may be blocked.
简答应8：30到这儿，但现在9：00了她还没到。路上可能堵车了。
5. shall是近几年全国各省市高考中考查频率较高的一个重点情态助动词。主要掌握以下内容：shall与第一人称搭配，用于疑问句，表提出请求或征求意见；与二、三人称搭配，用于陈述句（肯定句和否定句），表警告、威胁、允诺、命令、强制、决心等。
Shall he open the window?
他打开窗户好吗？（表征求意见）
You shall get the justice that you want.
你会得到你想要的公平。（表允诺）
You shall not use my camera if you don’t use it properly.
如果你不正确使用，我不会让你使用我的照相机（表警告）
No, he shan’t go.
不! 他不能去。（表命令）
Nothing shall stop us from carrying out this plan.
什么也阻挡不了我们实施这项计划。（表决心）
6. must和should推测之外的用法。
上面讲了must在肯定句中表推测的用法，must在肯定句中还有“必须”的用法。注意二者不要混淆。另外，must还有“偏偏，非要做…”的意思。
We must do everything step by step.
我们一定要一步一个脚印地做每一件事情。
If you must smoke, please go outside.
如果你非要抽烟，请出去。
When everybody was in bed, he must turned the radio on.
大家都上床睡觉了，他偏偏把收音机打开了。
should表示吃惊、赞叹、不满等情绪，也是近几年来的高考热点。
It’s wonderful that you should have achieved so much in these years.
这几年你们有了这么大的成就真了不起。
You can’t imagine a gentleman like him should treat a lady so rudely.
你想象不出来象他这样一位绅士竟然会如此粗鲁地对待一位女士。
7.need和dare即可以作情态助动词，也可以作实义动词。
need用作情态助动词时，无人称、数、时态的变化，主要用于否定句和疑问句。
You don’t need to do it yourself.
你不必亲自去做这件事。（实义动词）
You needn’t do it yourself.
你不必亲自去做这件事。（情态助动词）
dare用作情态助动词时，无人称、数的变化，但有过去时态，主要用于否定句、疑问句和条件句。
You should dare to say no to her requirement.
你应该敢于拒绝她的要求。（实义动词）
You daren’t say no to her requirement.
你不敢拒绝她的要求。（情态助动词）
8.情态助动词+ have done sth.
情态助动词+ have done sth. 表示对过去(而不是现在或将来)应该发生而未发生的事情的态度和推测，不同的情态助动词表示不同的意思，这也是近几年来高考的热点。
should/ought to have done sth. 表示过去本应该做某事而事实上未做。
I should have driven her home yesterday evening.
昨天晚上我该开车送她回家了。（事实上没有送她回家）
shouldn’t/oughtn’t to have done sth. 表示过去本不应该做某事而事实上做了
You shouldn’t have had a quarrel with her.
你不该与她吵架了。（事实上与她吵过了）
need have done sth. 表示过去本有必要做某事而事实上未作
You need have met her at the station.
你很有必要到车站接她了。（事实上没去车站接她）
needn’t have done sth. 表示过去本无必要做某事而事实上做了
You needn’t have cleaned the room for me.
你不必为我打扫房间了。（事实上已打扫了）
could have done sth. 表示过去本可以做某事而事实上未做
I wasn’t busy then and you could have asked me for help.
我当时不忙，你本来可以向我求助的。（事实上未向我求助）
注意：上述表达都是虚拟语气，与事实相反。而must have done sth.和can’t have done sth.只是对过去事情的推测，不表示与事实相反。
The ground is wet and it must have rained last night.
地湿了，昨天夜里一定下雨了。
His bike is here and he can’t have gone back home.
他的自行车还在这儿，他不可能回家了。
❾ 高中英语情态动词的用法有哪些
情态动词的考点精简
一、何谓“情态动词”？
情态动词主要用来表示说话人的情感、态度等，是中学英语语法的重点，也是高考的热点，是单项填空必考的一个知识点。高考试题常常借助语境和句子之间意义上的细微差别来考查学生对情态动词的基本用法及其区别，近五年高考中主要考查四点：情态动词表示推测和可能性的用法；情态动词与虚拟语气；情态动词的表达“情感、态度、语气等”，情态动词表示 “必要性”等方面的用法。
二、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
三、情态动词的否定形式
情态动词+ not +动词原形can not: can't , must not: mustn't , need not : needn't
四、情态动词的用法（常考考点）
Shall
一）用于一、三人称疑问句中，表示说话人征求对方意见和向对方请示。
Shall we begin our class? Shall he come in, sir? (征求对方意见)
二）用于二、三人称 表命令、许诺、警告、规定、威胁、决心、也用于宣布法律、规定的要求
1. You shall get my reply tomorrow. (许诺)
2. “The interest shall be divided into five parts, according to the agreement made by both side. （命令）
3. You shall be sorry for what you said one day, I tell you. (警告、威胁)
4. Nothing shall stop us from advancing. (决心)
5. —What does the sign over there read?
—“No person shall smoke or carry a lighted cigarette，cigar or pipe in this area.”(要求)
Should
一）应该，表示责任、义务
According to the air traffic rules, you should switch off your mobile phone before boarding.
二）竟然、（ 从句中） 惊奇、怀疑、不满(expect\, think, believe等词后） 委婉 客气（第一人称 ） 惊讶、埋怨 （二、三人称） 万一（ if 从句中）
1.） it’s a pity that he should be so careless. (竟然)
2.） I never expect that you should have come here. (惊奇 )
3.） I should advise you not to do it. (委婉 客气)
4.） Who should come to see you when you are in trouble! (埋怨 )
5.）If you should change your mind, please let me know. (万一)
三） 表示合理的推测
The video should be very interesting, in which you can see foreigners making Jiaozi ring the Spring Festival.
四）if 引导的虚拟条件句中，从句中只可出现should.
Should I have time, I would go there with you.
五）要求，命令和请求含义的动词后，接宾语从句，从句中谓语“should do”,should 可以省略
Tom suggested that I (should) go there at once.
六）should have done 本应该做但是没做
shouldn’t have done 本不应该做但是做了
You should have studied hard.
Must
一）表示必须要做的事: 必须
-Must I get to the station before three o'clock?
-Yes, you must. ( No, you needn't. )
二）用于指 偏要、硬要 （ 令人不快的事）
1. The car must break down just when we were in the jungle. (偏要)
2. -- Could I have a word with you, mum?
-- Oh, dear, if you must.
3. – Who is the girl standing over there?
-- Well, if you must know, her name is Mabel.
三）用于表肯定的猜测
He is absent today, and something must have happened to him.
She must be at home now, as I just called her.
四）禁止 (否定句)
You mustn’t make noises in the library. (禁止) (注：mustn’t没有表推测的意思)
Can\ could
一） 能力（陈述句）He can swim./ He could swim when he was a child.
二） 惊异、怀疑、不相信（否定、疑问、惊叹句）How can you be so careless？
三） can’t 表推测“一定不是” He can’t be Mr. White, because I don’t know him.
四） can/ could 用于否定和疑问表猜测 I lost my purse. Where could I have put it?
五） can 用于客观事实的推测，可能出现的某种现象
He is friendly, but sometimes he can be difficult to get along with.
The northern part of China is cold, but sometimes it can be warm.
Nowadays, graates can have difficulty finding jobs.
六） be able to do sth. 经过努力能达到
4. The fire in the hotel spread fast but fortunately all of the people were able to ran out. (经过努力能达到)
May \ might
一）祝愿（祈使句） May you return in safety. (祝愿)
二）可以（语气弱）. May I come in ? (可以)
三）表推测，不太可能的推测 Helen may go on the trip with us, but she isn’t quite sure yet.
四）may as well do sth. Now that you are here, you may as well try your best.
may well do sth. He may not well go with us—he hates travel.
五）might用于虚拟 If he came here tomorrow, he might have a chance of talking with her.
Will
一）意愿、决心、习惯性、倾向性、请求
1. I’ll do my best . (意愿)
2. I will never do such a thing again. (决心)
3. Fish will die without water. (习惯性、倾向性)
4. Will you give me a piece of paper? (请求)
二）区分于be going to, 表示没有计划，临时决定
---I’m sorry. I forgot to send the letter for you.
--- It doesn’t matter. I will go myself.
Would He promised he would never smoke again. (will的过去式)
Would you…? “I would like to… (婉转语气)
Last year our English teacher would sometimes tell us stories in English after class.
(过去的习惯动作,比used to正式，并没有“现已无此习惯”的含义。)
It would be about ten when he left home. (表料想或猜想)
Dare \ need
1. I dare to go there alone at night.
2. Do you dare to go there alone at night? = Dare you go there alone at night?
3. I don’t dare (to )go there alone at night. = I dare not go there alone at night.
dare say\ dare tell \ dare speak
4 needn’t have done 本没有必要做，但是做了
You needn’t have waited for her, as she didn’t go there.
情态动词+ do 表示对现在的推测
情态动词+ have done 表示对过去的推测（对过去的一种结果的假设或虚拟）
(1) should (not) / ought (not) to have done本（不）应该做某事，但却没有做或做了，含有责备或后悔之意。
例如： —I’m sorry. I _________at you the other day. B
—Forget it. I was a bit out of control myself.
A. shouldn’t shout B. shouldn’t have shouted
C. mustn’t shout C. mustn’t have shouted
(2) could have done本来能够做某事但未做。例如：
Thank you for all your hard work last week. I don’t think we ______ it without you. B
A. can manage B. could have managed
C. could manage D. can have managed
(3) needn’t have done本没有必要做某事但却做了。要注意needn’t do则表达“没有必要去做某事”，时间上应该是现在或将来。例如：
—Catherine, I have cleaned the room for you. B
—Thanks. You ________ it. I could manage it myself.
A. needn’t do B. needn’t have done
C. mustn’t do D. shouldn’t have done
(4)would (not) have done本来(不)会发生某事，但却（发生了）或没有发生。常用于虚拟条件句或含蓄虚拟条件引导的虚拟语气，表示对过去所发生事情结果的假设。例如：
He hesitated for a moment before kicking the ball, otherwise, he ________ a goal. D
A. had scored B. scored
C. would score D. would have scored
(5) might have done表示“本来可能……”，但实际上没有发生的事。例如：
What a pity! Considering his ability and experience, he ________ better. D
A. need have done B. must have done
❿ 高中英语：情态动词+have done
can't have done,一定不可能做过某事,对过去发生的事作非常有把握的否定推测
couldn't have done多用在虚拟语气当中回Without your help, we couldn't have finished our work last week so fast.没有你的帮忙,我们答上星期不可能这么快完成工作.(实际上工作已完成)
"他一定在家里",一般翻译为He must be at home.