關系副詞where主要用于修飾表示地點的名詞，同時它在定語從句中用作地點狀語。如：
This is the village where he was born.這就是他出生的村子。
與when的用法一樣，注意不要一見到先行詞為地點名詞，就以為一定要用關系副詞where來引導定語從句，同時還要看它在定語從句中充當什么成分——如果在定語從句中用作地點狀語，就用where；如果在定語從句中不是用作時間狀語，而是用作主語或賓語，那就不能用where，而要用that,which等。
which的用法
1、(用作疑問代詞)哪一個,哪一些
Which is my seat?
哪個座位是我的?
2、(用做關系代詞)那一個,那一些
He also had a gun with which to defend himself.
他還有一把自衛用的槍。
He invited us to dinner, which was very kind of him.
他邀請我們吃晚飯,他這么做真是太客氣了。
She was very fond of speaking French, which indeed she spoke well.
她很喜歡講法語,而且確實講得不錯。
He lives in the house which is opposite ours.
他住在我們對面的那棟房子里。
which作為形容詞用法如下
1、(用作疑問形容詞)哪一個,哪一些
Which university did you go to, Oxford or Cambridge?
你上過哪所大學?牛津還是劍橋?
2、(用作關系形容詞)這個,這些
The doctor told him to give up smoking, which advice he took.
醫生叮囑他戒煙,他接受了這一忠告。