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1.虚拟语气在主语从句中的用法

虚拟语气常用在由形式主语it引导的主语从句中。谓语动词用“should+动词原形”，但should一词可以省略；表示过去的情况，谓语动词"should have+过去分词"。

e.g. It is necessary that you should clean the workshop after work.

下班后，你必须清扫车间。

2.虚拟语气在宾语从句中的运用

用在表示愿望、建议、命令、请求等动词所引导的宾语从句中。在这类动词引导的宾语从句中，谓语动词采用虚拟语气，即“should+动词原形”或省略should只用动词原形。

e.g.I suggested that we (should) form a spare time study group.

我建议成立一个业余学习小组。

3.同位语、表语从句中的虚拟语气

在表示命令、要求、提议、愿望等意义的名词后面的同位语从句或表语从句中，谓语动词用“should+动词原形”或“动词原形”。

e.g.His suggestion is that they (should) go to the cinema.

他建议他们应该看电影去。

4.优选试题

一、选择题

1. The doctor suggested that he ______ a short leave of absence.

A. will take B. would take C. take D. took

2. We demand that atomic weapons ____ .

A. be prohibited B. will be prohibited C. are prohibited D. ought to be prohibited

3. It was suggested that transistors _____ in such devices.

A. should be used B. should use C. can be used D. were using

4. The tutor recommended that she _______ this book.

A. must buy B. buy C. should have bought D. buys

5. The housemaster was strict. He requested that we ______ television on week nights.

A. not watch B. must not to watch C. not be watching D. have not watched

6. My father did not go to New York, the doctor suggested that he ______ there.

A. not to go B. won't be C. not go D. not go to

7.I demanded that the students each ______ a plan for the summer vacation.

A. would make B. will make C. make D. made

8. It is surprising enough that such a horrible thing ____ there.

A. happened B. will happen C. should happen D. has happened

9. It was urgent that she ______ the master immediately.

A. call B. calls C. called D. would call

10. He looks as if he _____ nothing about it before.

A. knows B. had known C. has known D. wouldn't know