二、该从句还可由关系副词引导：when(时间)，where(地点)，why(原因)
I shall never forget the days (when) we have been working together.
我将永远也不会忘记我们在一起工作的日子。
I know of a place (where) we can swim.
我知道一个可以游泳的地方。
That is the reason (why) I did it.
这就是我这样做的原因。
三、关系代词与关系副词替代问题：
有时关系代词可与关系副词替代：
Did you remember the years when (=in which) we had been working together?
你还记得我们曾在一起工作过的岁月吗?
This was the room where (=in which) I studied yesterday.
这就是我昨天学习的房间。
有时关系代词不能与关系副词替换：
This is the place (where) we met yesterday.
这是我们昨天碰头的地方。
This is the place (which) I’ve long wanted to visit.
这是我长期以来想去的地方。
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