A.could B.might C.would D.should

答案：C

4.shall、should和ought to

（1）shall用于第一、三人称,表示征询对方的意见或主动提出干某事。第二人称用will。

Shall I close the door?

Shall he go out now?

（2）shall用于第二、三人称陈述句中，表示说话人的命令、警告、强制、威胁、允诺等语气。如：

If you listen to me,I shall give you money.

如果你听我的，我就给你钱。

Tell him that he shall come to the teacher's office at once.

告诉他立刻到教师办公室来。

（3）should表示劝告、建议，译为"应当"，表示主观看法。还可以表示惊奇、遗憾、必要等语气，译为"应该；竟然会"。

ought to和should一样可表示劝告、建议，译作"应当"，常表示客观情况，否定式为ought not to,疑问式为ought sb.to ...

You should keep your promise.

你应该遵守诺言。

Can you imagine that he should speak to his mother like that?

你能想象他竟然那样跟他母亲说话吗？

If he set out on time,he ought to be here now.

如果他按时出发，现在应该到这里了。

（4）should表推测，意为"可能"或"应该"。

This shouldn't cause any problem.

这大概不会引起什么麻烦。

He should be ready,I think.

我想他应该准备好了。

活学巧用

4.单项填空

（1）（经典回放）-Excuse me,but I want to use your computer to type a report.

-You _________ have my computer if you don't take care of it.

A.shan't B.mightn't

C.needn't D.shouldn't

提示：shan't表示警告，句意："如果你不仔细使用，我不会让你用。"

答案：A

（2）-When can you get my car repaired?I need it tomorrow.

-It _________be ready by 8:00.

A.must B.need C.should D.might

提示：should表示推测，译为"应该会"。

答案：C

（3）Mr.Bush is on time for everything.How _________he be late for the important meeting?

A.would B.should