if____would 和 if____would have done 表示什么意思,两者有什么区别

问题描述:

if____would 和 if____would have done 表示什么意思,两者有什么区别
if____would 和if____would have done表示什么意思,两者有什么区别

if.,..would表示与现在事实相反的虚拟句,如If I were you, I would go.
if would have done表示与过去事实相反,如 We would have dropped by if we had had time.