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1.if引导的虚拟语气分类
if引导的条件状语从句中的虚拟语气可以分为真实条件句和虚拟条件句。
1.真实条件句（Sentences of Real Condition）：凡是假设的情况发生性可能很大，就是真实条件句。例如：
If I have time , I will help you with this work.如果我有时间会帮助你做此工作的。
If time permits, we'll go fishing together.(如果有时间的话，我们就一起去钓鱼。）
2).虚拟条件句（Sentences of Unreal Condition）：当假设是不大可能实现时，就是虚拟条件句。例如：
If I were you , I would have attended the meeting. 如果我是你的话，就去参加会议了。
If he had come here yesterday, he would have seen his old friend.假如他昨天来这儿的话，就会看见他的老朋友。
If it had rained yesterday, we would have stayed at home.（如果昨天下雨的话，我们就会留在家里。）
2.if条件状语从句中虚拟语气的判断
判断是真实条件句还是非真实条件句。只有在非真实条件句中才使用虚拟语气。
②与现在事实相反。
③与将来事实可能相反。
3.优选试题
选择题
1. If I __ you, I __ worry.
A.were/ wouldn’t B.was/ wouldn’t C.been/ would have D.be/ would
2. ___, I would take an umbrella with me.
A. If I Had been you B. I were you C. If I were you D. I had been you
3. If it ___ tomorrow, what would we do?
A. rains B. were to rain C. would rain D. rain
4. ___ today, he would get there by Friday.
A. Would he leave B. Was he leaving C. If he were to leave D. If he leaves .
5. ____ to the doctor right away, he might have been alive.
A. If he went B. Were he gone C. Should he have gone D. If he had gone
6. If we ____ here ten minutes earlier, we ___ the bus.
A. arrived/would catch B. arrived/would have caught
C. had arrived/had caught D. had arrived/would have caught
7.If he had not gone out in the storm _____.
A.he will be alive now B.he would be alive now C.he would have been alive now
8. We ___ our lives if it had not been for the policeman.
A. would have lost B. should lose C. might lose D. could lose
9. If he___to the teacher attentively just now, he___the answer now.
A. had listened, would have known B. listened, would know
C. listened, would have known D. had listened, would know .
10. If I had known her name, ___.
A. I should invite her to lunch B. I would invite her to lunch
C. I had invited here to lunch D. I would have invited her to lunch
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