He acted as if he had never lived in England before.这句话中为什么最后加了个before
问题描述：
He acted as if he had never lived in England before.这句话中为什么最后加了个before
答
有时完成时中用before表示：以前；到目前为止
他的表现（行为）好像他以前从未在英国居住过.
再如：
I have seen the film before.我以前看过这个电影（所以对其情节等有所了解,即对现在仍有影响）