IF引导的三种时间虚拟条件句结构

在虚拟语气中，if引导的虚拟条件句是最为核心的，很多学生问我对应的三种时间结构是什么，今天我给各位同学进行了罗列。

	从句	主句
与现在事实相反	if + 主语+ did/were…	主语+ would/could/should/might do…
与过去事实相反	If+主语+had done…	主语+would/could/should/might have done…
与将来事实相反	If+主语+ did/were to do/should do…	主语+ would/should do

给大家附上三个例句：

If I were you, I would try it.   与现在事实相反

If he had realized that, he would have run away while there was still time. 与过去事实相反

If it were to/should rain tomorrow, the meeting would be put off. 与将来事实相反