情态动词讲解和练习题（含答案）
高中英语——情态动词
一、考点、热点回顾
厨房在哪个方位最好
情态动词的用法
1. can 用法
1）表示能力，与be able to同义，但can只用于现在时和过去时，be able to可用于各种时态。Two eyes can e more than one.
注：Can you …? Yes, I can / No,I can’t.
论文中期检查表2).表示允许、请求
用could比can 语气更加委婉客气，常用于could I /you …..?句型中，若表示同意时，用can回答而不用could .
Could I borrow the book ? No, you can’t .
3）表示推测“可能”常用于否定句或疑问句中。（can’t表示一定不是）
It can’t be true .
Can it be true ?
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2. may 用法
1）表允许，请求= can
表示许可或征求对方的许可，常于第一人称连用。
注：May I ….? Yes ,you may No, you can’t / mustn’t .
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, plea. / Certainly.
2）表推测，可能、也许。常用于肯定句中。
Maybe he knows the news .=
教务处工作计划He _____ _____ the news.
3. must
1）表示义务。意为“必须”（主观意志）。
We must do everything step by step.
注：Must I ….? Yes, you must / No,you needn’t(don’t have to ).
--Must we hand in our exerci—books now?
--No, you needn’t. / No, you don’t have to.
2）mustn’t 表禁止、不允许。
You mustn’t talk to her like that.
3）表示揣测。意为“想必、准是、一定”等，只用于肯定句。否定、疑问句中must改为can .
He must be ill. He looks so pale.
She’s wearing a diamond necklace. She must have a lot of money.
注：must表推测时，其反义疑问句与must后面的动词一致。
There must be something wrong ,____ ____?
4.need的用法
need既可用作情态动词，也可用作实义动词。用作情态动词时，主要否定句或疑问句中。用作实义动词时，可用于各种句式。
1).用作情态动词，用于否定句和疑问句中。
a).Need I ….? Yes , you must / No, you needn’t .
Need we finish the work today ?Yes you __?
A.need
B.can
C. may
D.must
b).need + do sth . 变否定句：needn’t do sth
变疑问句：Need sb do sth ?
2).用作实义动词
a).need + to do sth . We need _______(buy) some school things .
变否定句：don’t /doesn’t /didn’t +need to do sth .
变疑问句：Do / Does /Did sb + need to sth ?
Yes , … do/ does / did No, sb don’t / doesn’t /didn’t .
You don’t need to do it yourlf.
b).当主语是物时。Sth + need + doing sth = Sth +need to be done .
The table needs painting . =The table needs _____ _____ _____ .
5.had better 的用法
1). had better + 动词原形= It’s best to do sth .
You had better ______ (stay )at home . = _____ ______ ______ stay at home .
2). Had better not +动词原形
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We had better ________(not play ) the computer games .
6.must 与have to
1).一般情况下，两者可互换。must = have to
2).must “必须，应该”表示说话人的主观看法，即说话人认为必须干某事。（内在原因）
have to ―必须，不得不”强调客观需要，即外界因素迫使某人不得不干某事。（外界原因）I can’t stop playing the computer games . For your health ,I’m afraid you ______.
A.can
B.may
C.must
D.had to
情态动词后跟完成式和进行式的用法
1.情态动词后跟完成式，表“原本应该干某事，而实际上没干”
I should have finished the work earlier.
He isn’t here. He must have misd the train.
2. 情态动词后跟进行式，表示“想必正在……”，“可能正在……”，“应当正在”等意。
It’s twelve o’clock. They must be having lunch.
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They may be discussing this problem.
He can’t be telling the truth.
She shouldn’t be working like that. She’s still so weak.
情态动词的同义转换.
1.can = be able to
2.must = have to
3.needn’t = don’t have to
4.need do sth = need to do sth .
二、典型例题怎么治咳嗽
1.(2010 .河北中考) —Do we have to finish our homework this afternoon?
—Yes, you ________.
A. must
B. can
C. may
D. need
【答案】A
2.（2010·娄底中考）—Must I be in hospital for a week，Doctor?
—No，you . You can go back home tomorrow.
A.mustn’t
B.needn’t
C. must
【答案】B
3.(2010.盐城中考)The desk is not dirty.You_______clean it.
A.mustn’t
B.shouldn’t
C.needn’t C.can’t
【答案】C
4.(2010.内江中考)—What is your mother going to do this Saturday?
--I’m not sure.She_____go to e my grandmother.
A.can
B.must
C.may
【答案】C
5.(2010·潍坊中考)—Is Jessica giving us a speech this evening?
--No, it ________be her. She________ to Japan.
A.mustn’t ; has gone
B.mustn’t ;has been
C.can’t ;has gone
D.can’t ;has been
【答案】C
6. （2010·南京中考）It’s the library! So you________ know shouting is not allowed here.
