關係副詞

關係副詞 where、when 和 why 可以放在句中，也可以加在子句。在正式書寫上，一般會用到「介系詞 + which」的句型，用關係副詞則是較普遍的用法。

引導關係子句的「介系詞 + which」結構，較正式	使用關係副詞的結構，較為普遍
That's the restaurant in which we met for the first time.	That's the restaurant where we met for the first time.
That picture was taken in the park at which I used to play.	That picture was taken in the park where I used to play.
I remember the day on which we first met.	I remember the day when we first met.
There was a very hot summer the year in which he was born.	There was a very hot summer the year when he was born.
Tell me the reason for which you came home late.	Tell me (the reason) why you came home late.
Do you want to know the reason for which he is angry with Sally?	Do you want to know (the reason) why he is angry with Sally?