IV. 虚拟语气用在其它状语从句中 

1．  虚拟语气用在由as if, as though 引导的方式或让步状语从句中，一般情况下，如果主谓语动词为现在时，从句谓语多用过去时；如果主句谓语为过去时，从句谓语多用过去完成时。

虚拟语气用在 even if, even though, whatever引导的状语从句中，从句谓语可参照由if引导的虚拟条件从句的谓语，一般用过去时或过去完成时。例如：

This old machine runs as if it were a new one.

The old worker works as though he were a young man.

Even though she had been here very soon, she would not catch the train.

Example:

He has just arrived, but he talks as if he ______ all about that.

a. know    b. knows   c. known    d. knew

I can’t stand him. He always talks as though he _____ everything.

a. knew    b. knows   c. has known   d. had known

______ I used a lot of examples I still could not get my idea across.

a. Since   b. But that    c. Now that    d. Even though

2.        虚拟语气用在so that, lest （唯恐）, in case （万一）, unless, in order that（为了，以便）, that（为了，以至于）, for fear that （生怕，以免）, on condition that （如果）等引导的目的，条件状语从句中，从句谓语 may 或 might+原形动词，也有用 should, can, could+原形动词构成的。例如：

The teacher explained the law once more in order that we might understand it better.

Some people eat so that they may live. Others seem to live in order that they may eat.

一些人吃是为了生存，而另一些人似乎是活着就是为了吃。

I left him a note with my address on for fear that he should not know where to see me.

The heroes gave their lives that we might live a happy life.

为了我们过上幸福生活，英雄们献出了自己的生命。

Example:

In case I ______, I would try again.

a. will fail   b. would miss   c. should fail     d. shall miss

You should exercise vigilance _____ you should be killed.

a. so that   b. lest   c. therefore   d. that

3.        虚拟语气用在由 “whether” 引导的让步状语从句中，从句谓语用原形动词。例如：

All engines work on this principle, whether they be large or small.

所有发动机都按这一原理工作，无论它们是大还是小。

We must finish the work before we go home, whether it be early or late.

无论时间早晚，我们必须在回家前干完工作。

All matter, whether it be gas, liquid or solid, is made up of atoms.

所有物质，不论是气体，液体，或固体，都是由原子构成。

在此句型中，可省去 whether ，而将be放在主语前。例如：

Be it so, we must continue to do the test.

We must do our best to fulfil the task, be it ever so hard.

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