初中常用情态动词总结

can/could

1) 表能力=be able to

Can you dance? Yes, I can. / No, I cant.

2) 表请求，允许 (could语气较委婉）

Can I use your pen? Yes, please./No, Im afraid not.

3）表猜测，可能，多用于否定句及疑问句，并表不太可能。（could可表虚拟）

He cant be at home now.

What can he be doing?

4）其它常用语

I cant help laughing. (禁不住）

I cant but ask him about it.（只得）

may/might

1) 表猜测

He may not know it.

She may be ill.

2) 表请求，许可

May I use your pen?

May I smoke here? Yes, you may. / No, you mustnt (cant)

*3) 表责备，只用might，且用于肯定句。

You might ask before you borrow my car.

You might have helped me.

*4) 其它用法

You may as well give him the letter. (还是）

His appearance has changed so much that you may well not recognize him.(很可能）

must

1）表命令，许可 = have to

Must I go now? Yes, you must. / No, you neednt.

mustnt意为不许

You mustnt smoke here.

2) 表猜测，可能性较大

He must be an actor.

need

表必须，仅用于否定句或疑问句中，在肯定句中一般用must, have to, ought to,或should代替。

You neednt come so early.

Need I finish homework today? Yes, you must.

shall/should

1）表命令，在某种程度上相当于must，ought to

You should do as I told you.

2) 表建议，要求

You should tell the the police.

3) 询问意见

Shall I get you some fresh coffee?

will/would

1）表意愿

I wont argue with you.

2) 表请求，邀请

Will you go with me?

Would you please close the door?

今天做得头发大了，其余的以后再慢慢加上吧！