混合/错综型虚拟语气：当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，称为‘错综条件句’，动词的形式要根据它所表示的时间作出相应的调整。

相关介绍

例句：

If you had followed my advice, you would be better now.(从句说的是过去，主句是现在)

If I were you, I would have taken his advice.(从句是现在，主句是过去)