区分if 引导的是真实条件句还是非真实条件句,即虚拟语气。非真实条件句表示的是假设的或实际可能性不大的情况,故采用虚拟语气。虚拟语气用来表示说话人的主观愿望或假想,所说的是一个条件,不一定是事实,或与事实相反。虚拟语气在条件句中应用比较多。
所以记住虚拟语气的定义
例子 :
If he comes, he will bring his violin. 如果他来,会带小提琴来的。可以实现
If you leave now, you will never regret it. 可以实现
虚拟语气:
If he had come yesterday, I should / would have told him about
it.如果他昨天来的话,我会把这件事告诉他的。
含义:He did not come yesterday, so I did not tell him about it.
追问那将来的虚拟呢
追答你看看下面的连接 说的很详细
参考资料:http://baike.baidu.com/view/26751.htm