一、什么叫错综时间虚拟条件句

　　所谓错综时间虚拟条件句即条件从句与主句所指时间不一致，如从句指过去，而主句即指的是现在或将来，此时应根据具体的语境情况，结合上面提到的三种基本类型对时态作相应的调整：

　　If it had rained last night, the ground would be wet now. 要是昨晚下过雨的话，现在地面就会是湿的。

　　You would be much better now if you had taken my advice. 假若你当时听我的话，你现在就会好多了。

　　二、一点特别说明

　　条件从句用 if I were时，既可指现在也可指过去：

　　If I were you, I would stay. 我要是你我就会留下。

　　If I were you, Id go to night school. 我要是你，我会上夜校。

　　If I were not busy, I would have come. 假若我不忙，我早就来了。

　　也可用 if I had been you也表示过去：

　　If I had been you，Id have taken the job. 我要是你，我就接受那份工作了。