as if引导的从句,主语为第三人称时,系动词be用was还是were（主句为过去时态）

as if 引导的方式状语从句所表的的内容如果与实际情况相反,或者发生的可能性不大,则需要使用虚拟语气,也就是你说的系动词be用were,不论主语为第几人称.这是第一种情况.
如：It seemed as if the meeting would never end.看起来会开起来没完没了的.（会议终究会结束）
但是,如果从句中是可能性较大的事实的话,be动词不需变为were.
如：It seemed as if is was going to rain.仿佛天要下雨.（下雨的可能性较大）.
所以,更正楼下.

were

were
此处为虚拟语气，主语第几人称不影响，都是were
as if I were
as if she were