5 years ago 和 5 years before 如何区分?

5 years ago 和 5 years before 如何区分? ten years before 和ten years ago 有什么区别? many years before和many years ago的区别 five years before 用法和five years ago的区别 ten years before和ten years ago的区别? than 10 years before/ago 例：three years ago/three years before 如何判别该使用什么时态? before和ago可以一起用吗?比如 he became cery rich before two years ago I saw her there years ago.和I saw her there years before. 帮我翻译一下ten years ago和 ten years before Thirty five years ago和Thirty five years before有什么区别? ago是不是等于before?比如ten years ago是不是等于ten years before等于before