语法解读

情态动词can,could;may,might;will,would;shall,should,must和can't的用法一览表

分类 用法说明 例句 can can 表示"体力或脑力方面的能力""许可""可能性""惊异"等。在口语中can可以代替may表示许可,而may则比较正式。 Some of us can use the computer now,

but we couldn't three years ago.(能力)

You can go now.(许可)

What on earth can this mean?(惊异) could could可以代替can,表示语气婉转。 Could you wait a few days for the money? may may表示允许或征询对方许可,有"可以"的意思。用作此意时,它的否定形式可用may not,(相当于can not）,但在表示"不可以""禁止""阻止"等时,常用mustn't 代替may not。 You may go now.(可以)

May I have a word with you? (询问)

May I watch TV? 

Yes,you may.(不能用can,might代替)

No,you mustn't./may not./had better not.might用might时语气更加不肯定。He might arrive on time. will (1）表示"意志""意愿"用于各种人称。

(2）在疑问句中,用第二人称时,表示询问对方的意愿或向对方提出请求。

(3）表示习惯性动作,"总是""惯于"。

(4）表示一种倾向。

(5）表示推测。Will you close the door? Will you go with me?

Fish will die without water.

Boys will be boys.

This will be the book you are looking for. would 1）would是will的过去式,表示过去时间的"意志""愿望",用于各种人称。

2）表示说话人的意愿或对对方提出的请求,语气比will婉转。指的是现在的时间。

3）表示过去的习惯动作。 They said they would help us.

Would you like some bananas?

Would you like to see a film?

Yes,I'd like to.

She would sit like that for hours. shall shall肯定句中用于第二、三人称,表说话人的意愿、命令、警告、威胁、允许等；疑问句中,用于第一、三人称,表征求对方的意见或请示。 You shall do what I say.

Where shall I wait for you?

Shall he come at once? should 表"劝告""建议"时,可译为"应该"多指主观上觉得有责任、有义务应该做某事或处于某状态。 You should keep your promise.

They should be strict with her.

We should speak more English. must 表"必须,必要",后接动词原形,着重表示主观必需；表"猜测"时,用于肯定句。 We must study hard.

He must be a honest boy.

She must have been to America before. can't 表猜测时,用于否定句。 That man can't be Mr.Smith,because he was ill at home. 　　为了便于记忆情态动词的基本用法,可参照下列情态动词用法记忆口诀：

　　情态动词两要点,

动词原形跟后面,