八年级下册语法专题一：情态动词should与could

专题归类复习一

情态动词should与could的用法

●语法讲解

1．should是情态动词shall的过去式，但有时并不表示过去。

(1)表示委婉的劝告或建议，意为“应该”。如：

You should hand in your composition at once.

你应该立刻交上你的作文。

(2)表示可能性或推断，意为“可能；应该”。如：

I think they should be there now.

我想他们现在应该在那里。

(3)用于特殊疑问句中，表示意外、惊奇、不能理解等强烈感情。如：How should you know that?

你是怎么知道那件事的？

What should you do to relax?

你该做什么来放松呢？

2．could是情态动词can的过去式，但有时并不表示过去。

(1)表示提议，比can更客气、委婉。

I could do the shopping for you, if you are tired.

如果你累了，我能帮你买东西。

(2)表示请求，语气比can更客气、委婉。

Could you show me the way to the hospital?

你能告诉我去医院的路吗？

●语法精练

Ⅰ.单项选择

( )1.Schools________allow students at least one hour

a day for sports.

A．would B．might

C．should D．could

( )2.________you tell me how to get to the post

office?

A．Must B．Need

C．Could D．Should

( )3.—When can I come for the photos? I need them

tomorrow afternoon.

—They________be ready by 12：00.

A．can B．should

C．might D．need

( )4.—Could I borrow your dictionary?

—Of course you________．

A．can B．must

C．should D．will

( )5.The basketball________his.He loves playing

basketball.

A．maybe B．may be

C．may is D．may not

( )6.We________keep the new traffic law and learn how to protect ourselves.

A．will B．would

C．shall D．should

( )7.—Could you please help me do my homework?

—Sorry.I________．You________do it by yourself.

A．could; may

B．couldn't; should

C．can't; should

D．can't; may

( )8.—How was the youth club last night, Mark?

—It was great fun.You________come.

A．must B．can

C．should D．may

Ⅱ.根据句意用should或could填空

1．Sally________make dumplings by herself when she was only five years old.

2．In school, all the classmates__________get on well with each other.

3．You________call her if you have something important to tell her.

4．You_________not drive after drinking.

5．_________I use your mobile phone，please?