同学你好，该知识点来自沪江网校《英语零基础直达大学六级【开学季特惠班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
for two years before通常表示“在……之前的两年”，比如
I had lived in America for two years before I came here.
我来这儿之前在美国住过两年。

在过去两年里，一般说in the past two years
past可以表示“刚过去的；刚结束的 ”
I haven't seen much of her in the past few weeks.
近几周来我很少见到她。
The past month has been really busy at work.
上个月工作实在是忙。

祝同学学习进步~