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, I d 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，I d have taken the job. 我要是你，我就接受那份工作了。
 
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