as if 虚拟语气的问题,He talks about Rome as if he had been to there.为什么用talkes不用talked呢?

题目

as if 虚拟语气的问题,He talks about Rome as if he had been to there.为什么用talkes不用talked呢?
He talks about Rome as if he had been to there.
明白从句表示与过去事实相反,可是什么是talkes不用talked呢?
He opened his mouth as if he would say something.
明白与将来事实相反,为什么主语的动词是opened不是opens?

答案