虚拟语气的have呢?与过去事实相反从句的谓语用had+过去分词,主句的谓语用would(should)have+过去分词.给出的例句：Ifyouhadpreviewedthetext,youwouldn’tfailtoanswerthequestion.这句话中“wouldn't”

Question

虚拟语气的have呢?
与过去事实相反
从句的谓语用had+过去分词,主句的谓语用would(should) have+ 过去分词.
给出的例句：
If you had previewed the text, you wouldn’t fail to answer the question.
这句话中“wouldn't”后面的have呢?
我觉得是混合虚拟语气，它举例比较不怎么恰当，但是这句话没有错。
例如：If I were you，I wouldn't have told him the truth.
Now he is unhappy.
如果我是你的话，我是不会告诉他事实真相的。现在他不高兴了。
If you had previewed the text, you wouldn’t fail to answer the question.
前半句是对过去的虚拟，后半句是对将来的虚拟，也可以理解为混合虚拟： 如果你已经（过去）预习过这篇课文，你就（即将）不会答不出这个问题。

Answer 1

这句话就是缺少have就不对了呀.
应该是”If you had previewed the text,you wouldn’t have
failed to answer the question.
再举个例子：
if i had known there was a English column at bai du,i would not have answered questions at dining column.
(如果我早知道百度里还有英语栏目,我就不会在饮食栏目回答问题啦)
o(∩_∩)o...