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语法总结10情态动词
1.定义 情态动词表示说话人对某一动作或状态的态度，或表示主观设想。情态动词不能 单独作谓语动词，后接动词原形。情态动词没有人称和数的变化。
2.情态动词的用法
can的用法
1.表示体力或脑力方面的能力，也表示根据客观条件能做某事的能力，意为“能够，会”。I can ride a bike.
2.表示允许，意为“可以”。Can I use your computer
3.表示推测，意为“可能”,但当can表示猜测或怀疑时，只用于疑问句和否定句中。He can't be only five.
could 的用法
1.是can 的过去式，表示过去有能力或过去的可能性，意为“能够，会”。 He said he could swim very well when he was a child.
2.表示委婉地提出请求或意见(在回答中不可用could)。 Could I watch TV this evening -Yes, you can./ No, you can't.
3.表示惊异、怀疑、不相信等态度，主要用于否定句、疑问句或感叹句中。 How could he be so careless
may的用法
1.表示请求、许可、可以。May I come in
2.表示说话人的猜测，认为某一事情可能发生。Susan may go abroad next week.
3.表示祝愿或愿望。May that day come soon.
might的用法
1.是 may 的过去式，表示“(过去)也许，可能”。
The accident might happen the day before yesterday.
2.可用于推测(其可能性比may低，语气更加不肯定)。It might rain tomorrow.
3.表示非常委婉地请求(比may更委婉),试探性地询问。Might I leave now
must 的用法
1.表示要承担的义务、必须遵守的命令，意为“必须”。Soldiers must obey orders.注意:在回答由must引起的问句时，肯定回答用must.否定回答不能用mustn't.而是用needn't 或don' have to.
2.表示肯定的推测,意为“一定,肯定";must have done表示“过去一定做过……"
He must be your father. I think you must have made a mistake.
3.must 和 have to 的区别:must表示“主观需要的必须”;have to 表示“客观上的不得不”。We must clean the classroom. We have to clean the classroom.
will 的用法
1.表示意愿、决心，可用于各种人称。I will tell you all about it.
2.表示请求，仅用于第二人称和疑问句中，即“Will you (please).. ”句型中。
Will you please buy me an envelope on your way home
would 的用法
1.是 will 的过去式，表示过去的意愿和决心。They said that they would help us.
2.用于现在时，表示委婉地提出要求、建议或看法。Would you like a cup of tea
shall 的用法
用于征求对方的意见或请求，只用于第一、第三人称。表示“要不要……好吗 ”Shall I close the window
should 的用法
1.表示义务，意为“应该”。We should help the old.
2.表示劝告或建议，意为“应该"。You should obey the traffic rules.
3.表示猜测或可能性。I think he should be at home now.
ought to 的用法
意为“应该”,强调义务，语气比should 要强，比must稍弱。但多数情况下，
ought to 和should 可互换。You ought to (should)visit your grandparents more often.
need 的用法
做情态动词时，表示“需要，必须”,多用于否定句和疑问句中。
You needn't come so early.
2.must 引导的疑问句，肯定回答多用must,否定回答用needn't.
Must I stay here any longer -Yes, you must./No, you needn't.
dare的用法 做情态动词，用于否定句或疑问句中，后接动词原形。Jenny dare not go out again.
初中语法情态动词练习
单项选择
( ) 1.-Can you ride a horse No, I .
A. needn't B. may not C.can't D. mustn't
( ) 2.--Mr. Wang, can I finish my homework tomorrow --Sorry, you___.
A. can't B. don't C. needn't D. won't
( ) 3.--May I go out now, Dad -No. You___ let your mother know first.
A.can B.may C.need D. must
( )4. The work is too hard for him. He __ finish it on time.
A.can't B. mustn't C. shouldn't D. needn't
( )5. The talented boy ___ write lyrics when he was ten.
A. may B. could C.must D.can
( )6,-Look, Sue is over there.--That___ be her. She is in China now.
A. mustn't B. can't C. needn't D. won't
( ) 7.-Oil is everywhere in this store, so you __ know smoking is forbidden here.--I'm sorry.
A. can B.may C.must D.need
( ) 8.You ___ always be careful with fire. It's dangerous.
A. can B. can't C. must D. mustn't
( )9.Must I return the book this week -No, you___. You can ___ it for 20 days.
mustn't; keep B. needn't; borrow
C.needn't; keep D. mustn't; borrow
( ) 10.-Never touch my computer while I'm away.-I___. I'm not interested in computers
A. shouldn't B. mustn't C. won't D. don't
( ) 11,-Who can it be I'm not sure. It__ be Lucy's friend ,LinMei.
A. mustn't B. can't C.may D. must
( )12,-Whose bike is this It ___ belong to Adam. Look! His bag is on it.
A.can B. may C. will D. must
( ) 13、-How is your friend coming -I'm not sure. He ___ drive here.
A. may B.can C.must D.will
( )14.-My house is near a very busy street, so I'm often disturbed by noise. -lt ___ be quiet. You should look for a new place.
A. can B. must C.can't D. mustn't
( ) 15.-Who's the man there Is it Mr. Black --It ___ be him. He's much taller.
A. can't B. mustn't C. should D.may
二、用所给词的适当形式填空
1.Don't always wait for good things to come. Everyone (need)to prepare as well as possible.
2.You (have)better check your papers carefully before handing them in.
3. Tom is a clever and creative boy, and he__ (dare)to express his thoughts.
4.The money we raised will be used___(improve)the living conditions of the children in poor areas.
5.I'm used to (keep)diaries in English every day to practice my English writing.
6.The road is wet. It must have (rain)last night.
7.Andy (have)to get up early because he needs to visit his grandparents today.
8.Please speak slowly, because I (can)follow you.
9.I will always (stand)by you whatever happens.
10.With the teacher's help, I will be able (speak)English well.

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