的时间概念来确定。

If you had had my advice just now, you would be better now.

If I were you, I would have taken his advice.

(2) 虚拟语气中 if的 省略

在if虚拟条件句中有should, had,或were时，可省略 if,把were, had, should 提到主语前面，变为倒装句式。

Should it snow tomorrow, we could have a snowball fight.

Were I to go deep into the sea, I could see the bottom of it with my own eyes.

Had you come earlier, you would have caught the bus.

(3) 含蓄虚拟条件句

有时，假设的情况不通过条件句表示出来，而通过介词短语，上下文或其他方式表现出来。有以下几种情况：

① without, with, but for等引导的虚拟语气。

Without water, there would be no life.

With your help, we might finish the task earlier .

But for your help, I wouldn't have passed the exam.

② or, otherwise, but 或通过上下文表示等引导的虚拟语气。

　You didn't come yesterday, or you would have seen him.

　He was busy yesterday; otherwise, he would have come to the party.

　Five minutes earlier and you could have met her at the station.

　Any man in his position would have done like that.

(4) 在If it were not for...或If it had been not for...句型中的虚拟语气。

If it were not for music, life would be dull.

If it had not been for my brother's help, I would not have finished the task.

3. 虚拟语气在其它句型中的运用

(1) as if/as though 引导的方式状语从句。如果从句表示的动作发生在过去，从句谓语动词用过去完成时；指现在情况，则用一般过去时；指将来情况则用过去将来时。

He orders me about as if I were his servant. 他处处使唤我，好像我是他的仆人。

He was shaking with fright as if he had seen a ghost.

It rained and rained, as if it would never stop.

(2) even if/even though等引导的让步状语从句。让步状语从句指事实时，从句谓语动词用陈述语气。若从句内容表示现在和将来假设的情况，从句谓语动词用虚拟语气。其谓语动词变化同虚拟条件句。

I should say the same thing even if he were here.

Even if he had been there, he couldn't have solved the problem.

Even if he should fail, there would be still hope.

(3) 在It is (high/about) time (that) ...句型中，后面谓语动词用过去时，或"should+动词原型"，should 不可省略，意为"该是......的时候了"。

It is (high/about) time that children went / should go to school.

(4) if only 引导的感叹句。与现在事实相反，谓语动词用过去时；与过去事实相反用过去完成时；与将来事实相反用"would/could +动词原型"，意为"若是......那多好啊；要是......就好了"。

I dread the coming exams. If only I could have time to review my lesson.

If only I had taken his advice.