Ⅰ 英语情态动词语法选择加讲解。
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。 情态动词
can 表示能力，意为 “能 会” 表示推测， 意为 “可能”， 常用于否定句和疑问句中 表示请求， 允许， 意为“可以”
could 是can 的过去式，意为“能、会”， 表示过去的能力 在疑问句中表示委婉请求
may 表示请求、许可，意为“可以” 表示推测，常用于肯定句中，意为“可能、也许”
might 是may的过去式,表推测，常用于肯定句中，意为“ 可能、也许 ” must 表示主观看法，意为“必须、应该” 表有把握的推测，用语肯定句 Need \表示需要、必须，主要用于否定句和疑问句中 dare 表示敢于，主要用于否定句和疑问句中
should 意为“ 应该”， 表示要求和命令 表示劝告、建议 had better 意为 “最好”，表示建议 used to意为 “过去常常，表示过去的动作、行为 考点一 情态动词知识清单
情态动词有具体的词义，但也同助动词一样，需要与其他词语一起构成句子的谓语，另外情态动词没哟人称和数的变化，情态动词后必须跟动词原形。
1. can 的用法
（1） 表示能力、许可、可能性。 表示能力时一般译为“能、会”， 即有种能力，尤其是生来具备的能力，此时may 和must 均不可代替它。 （2） 表示可能、能够。 如：I can finish it in an hour. （3）表示许可，常在口语中。如：You can use my dictionary. （4）表示推测，意为“可能”， 常用于否定句和疑问句中， 此时can‟t 译为“ 不可能”。 2. could的用法
（1） can的过去式， 意为“ 能、 会” ， 表示过去的能力。 （2） could 在疑问句中， 表示委婉的语气，此时没有过去式的意思。 3. may的用法
（1）表示请求、许可， 比can 正式，
（2）表示推测，谈论可能性，意为“ 可能， 或许”，一般用于肯定句中。
（3） may的过去式为might ，表示推测时。可能性低于may 。4. must的用法
（1）must 表示主观看法，意为“必须、一定”。
（2）其否定形式mustn‟t 表示“ 一定不要 ” “千万别” “禁止, 不许”. （3）对must引导的疑问句，肯定回答为must， 否定回答为needn‟t 或 don‟t have to .
（4）must 表示有把握的推测，用于肯定句。当must 表示 肯定的判断、推测时，其反意疑问句要用实际问句的助动词来构成。 She must have finished writing, hasn‟t she? 5. need的用法
（1） need 表示需要、必须，主要用于否定句和疑问句中，其否定形式为needn‟t ，意为“没有必要，不必”。 用need 提问时，肯定回答为 must，否定回答为 needn‟t 。 如：----Need I stay here any longer? ----Yes, you must .-----No. you needn‟t .
(2) need 还可以作实义动词，此时有人称、数和时态的变化， 后边
多接动词不定式。
6. dare
的用法
dare
意为
“
敢、敢于
”,
用法近似于
need
，
有两种词性：
（
1
）
dare
作为情态动词，多用于否定句、疑问句或条件句中，无第
三人称单数形式，只有一般现在时和一般过去时。
（
2
）
dare
作为实义动词，此时有人称、数及时态的变化。注意：
在
口语中，
dare
的各种形式常与不带
to
的不定式连用。
Do you dare tell
her what I said?
7.
shall
的用法
（
1
）
shall
表示征求对方意见（多用于第一、三人称）
，
Shall we go out for a walk?
（
2
）表示决心、警告、命令（
多用于第二、三人称）
，
No one shall bring your beepers or mobile phones in the exam.
8.
should
的用法
（
1
）
should
意为
“
应该
”
，
可表示劝告、建议、义务、责任等。
We
should protect the environment.
（
2
）
should (would)like to do sth.
表示
“
想要、
愿意做某事
”
，
常用于口
语中。
Would you like to go with me?
你想和我一起去吗？
（
3
）
Should have done
表示对过去动作的责备、批评。
You should have finished your homework.
9.
will
的用法
will
表示意愿、意志、打算，可用于多种人称。
I will help you if I‟m free this afternoon.
10.
had better
的用法
had
better
意为
“
最好
”
，没有人称的变化，后面接不带
to
的不定式，
其否定形式为：
had better not
。
We had better go now. You had better not give the book to him.
考点二
含有情态动词的疑问句
1.
由
can
、
may
、
must
构成的疑问句
（
1
）句
式
：
Can/
May/
Must…
+
主
语
+
动
词
原
形
+….
？
如
：
Can
you
repair
the
car?
Could
he
be
a
good
student? May
I
borrow
your
ruler?Must we clean the room now?
（
2
）对
may
引出的问句，可以有下列回答方式：
Yes,
of
course.
Yes, certainly.Sure.No, you mustn‟t.No, you can‟t.
（
3
）对
must
引出的疑问句，回答为：
Yes, …must.No,… needn‟t/ don‟t
have to.
2. will
，
would
，
shall
的用法
（
1
）
will
在一般疑问句中表示客气的
“
请求、
劝说
”
。
would
是
will
的
过去式，语气更加客气、委婉。
Would
you
show
me
your
picture
book? Will you please give me a call?
（
2
）对
will/ would you…
的回答方式有以下几种：
Yes, I will. (No, I
won‟t.)Sure .
(I‟m
sorry
,
I
can‟t.)All
right.Certainly.
(No,
thank
you .)
Yes, please.
（
3
）
shall
引出的疑问句用于第一人称，
表示征求对方意见或客气的
请求。其回答方式有以下几种：
Yes, please.All right. No, thank you.
考点三
不同情态动词的否定意义也不同
1.
（
1
）
can‟t
可译为
“
不会
”
，
如：
I can‟t play basketball.
我不会打篮
球。
（
2
）当句子表推测时，用
can‟t
表达不可能，
He can‟t be ill. He
is playing chess with Tom.
can‟t
还可用来回答
“ May I …? ”
这样的
问句。
May I come in ?No, you mustn‟t. / can‟t.
can‟t
还可用于固
定习语中。
She can‟t help crying.
Ⅱ 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.
Ⅲ 高中英语必修3语法
情态动词
情态动词表推测的三种句式
1.在肯定句中一般用 (一定)，may（可能），might /can, could（也许，或许）。 （1）He must/may/might know the answer to this question? 他一定/可能/也许知道这个问题的答案。
2.否定句中用can’t / couldn’t(不可能), may not/might not(可能不)。 （1）It can’t/couldn’t be the headmaster. He has gone to America. 这不可能是校长，他去美国了。 3.疑问句中用can/could (能……?)。 （1）Could he have finished the task? 他可能把任务完成了吗？ （2）Can he be at home now? 他现在能在家吗？
注：以上三种句式中情态动词的语气按程度都是依次递减的。Might, could并非may, can的过去式，而表示语气较为委婉或可能性较小。
（二）情态动词表推测的三种时态
1.对将来情况的推测，用“情态动词 + 动词原形”。
（1）She must / may / might / could arrive before 5. 5:00前她一定/可能/也许到。
2.对现在或一般情况的推测，用“情态动词 + be”，“情态动词 +be doing”或“情态动词 + 动词原形”。 （1）He must / may / might / could be listening to the radio now. 他一定/可能/也许正在听收音机。
注：情态动词 should /ought to表推测时，意为“想必会，理应……”但与“have +过去分词”连用时，则又可构成虚拟语气意为“本应该做某事却没做”。例如： （4）It’s seven o’clock. Jack should/ought to be here at any moment. 现在七点钟了，杰克理应随时到达。（推测） （5）She should / ought to have attended your birthday party, but she had to look after her mother in hospital. （虚拟） 她本该出席你的生日晚会的，可是她得在医院照顾她妈妈。 （6）Tom should not /ought not to have told me your secret, but he meant no harm. （虚拟） 汤姆本不该告诉我你的秘密，可是他并无恶意。
助动词(auxiliary)主要有两类：基本助动词(primary auxiliary)和情态助动词(modal auxiliary)。基本助动词有三个：do, have和be；情态助动词基本的有十四个：may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to.had better 上述两类助动词的共同特征是，在协助主动词构成限定动词词组
名词性从句
主语从句
作句子主语的从句叫主语从句。主语从句通常由从属连词that，whether，if和连接代词what，who，which，whatever，whoever以及连接副词how，when，where，why等词引导。that在句中无词义，只起连接作用；连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。
宾语从句
名词从句用作宾语的从句叫宾语从句。引导宾语从句的关联词与引导主语从句表语从句的关联词大致一样，在句中可以作谓语动词或介词及非谓语动词的宾语。
表语从句
在句中作表语的从句叫表语从句。引导表语从句的关联词与引导主语从句的关联词大致一样，表语从句位于连系动词后，有时用as if引导。其基本结构为：主语 + 系动词 + that从句。例如： The fact is that we have lost the game. 事实是我们已经输了这场比赛。 That’s just what I want. 这正是我想要的。
【注意】whether 可引导表语从句，但与之同义的if却通常不用于引导表语从句。
同位语从句
同位语从句说明其前面的名词的具体内容。同位语从句通常由that引导，可用于同位语从句的名词有advice、demand、doubt、fact、hope、idea、information、message、news、order、problem、promise、question、request、suggestion、truth、wish、word等。
Ⅳ 英语必修三知识
高中英语必修三，四有哪些语法，知识点主要有虚拟语气，情态动词，非谓语，定语从句，名词性从句，状语从句，动词时态，强调句型，倒装句，倒装等。
Ⅳ 高中英语 必修一至必修三的语法有哪些
分为句法词法两大类。
词法每本字典上都有，牛津英汉字典比较好，各大书专店都有。
此法分八大类。
1 时态 语态属；2 定语从句 ；3 名词性从句： 宾语从句 主语从句 表语从句 同位语从句 ；4 状语从句 ；5非谓语动词 ：不定式 动名词 分词 ；6 情态动词 ；7 虚拟语气 ；8 特殊句式 ：强调句 倒装 反义疑问句 省略句
这只是大框 内容太多了
我建议你最好买本语法书像 张道真的 语法书比较好 王迈迈的语法书也不错 句法此法都包括了
Ⅵ 高一英语必修三必修四所有语法
没有那么多，也就是，必修三有：情态动词；名词性从句；必修四有：主谓语一致；非谓语-ing的用法；构词法
Ⅶ 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
Ⅷ 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。
Ⅸ 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)