Thirty five years ago和Thirty five years before有什么区别?不解..

Question

Thirty five years ago和Thirty five years before有什么区别?
不解..

Answer 1

ago和before的区别是：ago立足于现在,表示从现在起,若干时间之前；before立足过去,表示从过去某一时刻起,若干时间以前.ago 通常与一般过去时连用,不能与完成时连用；before通常与过去完成时连用.例如：
I met him three years ago .（距今）三年前,我遇到他.
I had met him three years before .（距当时）三年前我见到他一次.