情态动词can的基本用法

情态动词can的基本用法：

情态动词can有一定的词义,但不能独立存在,它必须与动词原形一起构成谓语。情态动词can没有人称和数的变化。其具体用法如下:

1.表示"能、会",指脑力或体力方面的"能力"。例如:

I can speak English.我会讲英语。

Jim can swim but I can't.吉姆会游泳,但我不会。

2.表示"可能",常用于否定句或疑问句中,指某种可能性，此时can’t?译为“?不可能”。例如:

Han Mei can't be in the classroom.韩梅不可能在教室里。

Can he come here today, please请问他今天能到这里来吗

3.表示"可以",常用于口语中,指许可或请求做某事，可以代替may。例如:

Can I have a cup of tea, please请问我可以喝一杯茶吗

You can go out.你可以出去了。

补充：can的过去式could，意为“?能、?会”，表示过去的能力

如：He could write poems when he was 10.??他十岁时就会写诗。

could在疑问句中，表示委婉的语气，此时?could?没有过去式的意思。

如:Could you do me a favour?你能帮我个忙吗—Could I use your pen?我能

用一下你的钢笔吗?—Yes, you can.可以。（注意回答）

情态动词can的基本句型：

1.肯定句型为:主语+can+动词原形+其它。例如:

They can play basketball.他们能打篮球。

She can dance.她会跳舞。

You can go to watch TV.你可以去看电视了。

2.否定句型为:主语+can not(can't/cannot)+动词原形+其它。表示"某人不能(不会。不可能)做……"。其中can't是can not的缩略式,英国多写成cannot。例如:

You cannot pass the ball like this.你不能像这样传球。

I can't ride a motorbike.我不会骑摩托车。

3.疑问句句型分为:一般疑问句句型和特殊疑问句句型两种类型。

⑴一般疑问句句型为:Can+主语+动词原形+其它。表示"某人会(能。可以)做……吗",用于口语时,常表示请求或许可。其肯定答语用""Yes,主语+can."作答;否定答语用"No,主语+can't."作答。注意答语中做主语的人称代词,应根据问句中的主语作相应的变化。其变化规则为:第一人称问,则第二人称答;第二人称问,则第一人称答;第三人称问,第三人称答。例如:

①-Can you sing an English song for us你可以为我们大家唱一首英语

歌吗

-Yes.行。(注意在Yes后面常省略I can)

②-Can I skate我可以滑冰吗

-Yes, you can.可以。

③-Can she climb hills她能爬山吗

-No, she can't.不,她不能。

⑵特殊疑问句句型为:

a. Who+can+动词原形+其它。该句型中who相当于主语。例如:

-Who can sing in English in your class你们班上谁会用英语唱歌

-Lily can. 莉莉会。

b.特殊疑问词(作定语)+名词+can+主语+动词原形+其它。该句型中的特殊疑问词常用how many, how much等。例如:

-How many boats can you see in the river你能看见河中有多少只船吗

-Only one boat.仅有一只。

c.特殊疑问词+can+主语+动词原形+其它。该句型中的特殊疑问词常用what, where, when等,一般用肯定陈述句作答。例如:

-What can you see in the picture你能在图画中看到什么

-I can see some birds and two big trees in it.我能看到一些鸟儿和两棵大树。

考查can的用法：

a. 考查can表示能力的用法。

在这一用法中，can表示能力，意思是"能，会"，其否定式can't表示"

不能"。在过去时中用could和couldn't。例如：

1. --- Where's Mr. Lee I have something unusual to tell him.

--- You ________ find him.

A. may not

B. may not

C. can't

D. can't

2. --- Finish drawing a horse in ten minutes. OK

--- Sorry. It ________ in such a short time.

A. may do

B. can't be done

C. must do

D. needn't be done

3. I have my own room in my house, so I ________ do what I want in it.

A. must

B. have to

C. need to

D. can

mend my car I ______ not start it.

A. Would; would

B. Must; must

C. Can; can

D. May; may

ride when she was three years old

A. Can

B. Could

C. Need

D. May

6. The boy ________ answer this kind of hard questions one year ago.

A. can

B. may

C. could

b. 考查can表示推测的用法。

在这一用法中，can意为"可能"，表示客观可能性，常常用于疑问句和否定句中。例如：

7. --- Who is the man over there Is it Mr. Li

--- No, it ________ be him. Mr. Li is much taller.

A. mustn't

B. may not

C. can't

D. needn't

8. --- Listen! Someone is singing in the next room. Who ________ it be Is it Wei Fang

--- No. It ________ be her. She is at school now.

A. will; may not

B. must; mustn't

C. may; can't

D. may; won't

9. --- Is Mr. Hu in the reading room

--- No, he ________ be there. He has gone to Tianjin.

A. mustn't

B. needn't

C. won't

D. can't

10. Class 3 won the football match! ________it be true