先行詞為表示地點的名詞且在定語從句中作狀語時用where,先行詞為表示時間的名詞且在定語從句中作狀語時用when,先行詞為reason且在定語從句中作狀語時用why.關系副詞的使用場合有兩種：
1.定語從句中,主,謂,賓成分完整時.
He will remember the day when he joined the Party.
2.定語從句中,謂語動詞為不及物動詞時.
He will remember the factory where he worked ten years ago.
This is the reason why he was late for school.
如果定語從句中,謂語動詞為及物動詞時,它后面又沒有賓語時,就要用關系代詞.
He will remember the day which he spent togeher with us.
He will remember the factory which he visited last year.
This is the reason which he gave/explained for his being late for
school.
in which 引導定語從句,作狀語.
He will remember the factory in which/where he worked ten years ago.
I don't like the way in which he spoke to his father.