二、該從句還可由關系副詞引導：when(時間)，where(地點)，why(原因)

I shall never forget the days (when) we have been working together.

我將永遠也不會忘記我們在一起工作的日子。

I know of a place (where) we can swim.

我知道一個可以游泳的地方。

That is the reason (why) I did it.

這就是我這樣做的原因。

三、關系代詞與關系副詞替代問題。

有時關系代詞可與關系副詞替代：

Did you remember the years when (=in which) we had been working together?

你還記得我們曾在一起工作過的歲月嗎?

This was the room where (=in which) I studied yesterday.

這就是我昨天學習的房間。

有時關系代詞不能與關系副詞替換：

This is the place (where) we met yesterday.

這是我們昨天碰頭的地方。

This is the place (which) I’ve long wanted to visit.

這是我長期以來想去的地方。