She talks as if she had been there before是什么从句

问题描述:

She talks as if she had been there before是什么从句

虚拟语气

她说起来好像去过那儿似的。
对不存在的事情假设就是虚拟语气

虚拟语气,不是从句,
as if 是先行词
虚拟语气的标志是从句内的时态事主句的过去时