分四种
非真实条件句
错综时间条件句
含蓄条件句
还有种是省略与倒装
第一种就不说了,是学习虚拟的基础,然后第二种就是主句与从句的时间不一样,然后做调整就可以了
你说的是第二种,
举个例子
if you had followed the doctor's advice(then),you would be all right now
如果你那时听了医生的劝告,你现在就好了.
if you had followed the doctor's advice,you would have been all right then.
如果你那时听了一声的劝告,你那是就好了