He believed he loved her,and she loved him,it was as if fate had brought them together.

题目

He believed he loved her,and she loved him,it was as if fate had brought them together.
请问as if 后为什么用had+过去分词?

答案

这个应该是虚拟语气的用法.由as if/though 引导的方式状语从句常用虚拟语气,其用法为：
发生在主句动作之前：从句采用 had + 过去分词
与主句动作同时发生：从句采用 过去时(be 用were )
发生在主句动作之后：从句采用 would / could / might / should+原形动词.
而命运把他们两个牵在一起是发生在他们两人相爱之前,所以应该用 had + 过去分词.