关系副词在
定语从句中可用介系词加
关系代词的形式来代替。
用作
关联词的关系副词有when，where，why等。when在从句中用作时间状语，其
先行词须是表时间的名词。如：
We will put off the picnic until next week, when the weather may be better. 我们打算把
野餐推迟到下周，那时天气可能转好。(关系副词when的先行词是next week)
He came last night when I was out. 他昨晚来时我出去了。(关系副词when的先行词是last night)
since，before，after亦可用作表时间的关系副词。如：
Every hour since I came has been most enjoyable. 我来之后的每一个小时都是非常好玩的。(since用作关系副词)
On the day before we left home there came a snowstorm. 在我们离家的前一天，下了一场
暴风雪。(before用作关系副词)
The year after she had finished college she spent abroad. 她大学毕业后的一年是在国外度过的。(after用作关系副词)
that有时亦可用作表时间的关系副词。如：
It happened on the day that I was born. 那件事是在我出生的那一天发生的。(that=when)
where在从句中用作地点状语，其先行词须是表地点的名词。如：
They went to the Royal Theatre, where they saw Ibsen’s “The Doll’s house”. 他们去皇家剧院看了
易卜生的《傀儡家庭》。
The place where Macbeth met the witches was a desolate heath.
麦克白遇见女巫的地方是一片荒原。
where的先行词亦可是有地点含义的抽象名词。如：
He has reached the point where a change is needed. 他已到了需要改弦易辙的地步。(where的先行词point是抽象名词)
why在从句中用作原因状语，其先行词只有reason。如：
That is no reason why you should leave. 那不是你必须离开的原因。(why先行词是reason)
He refused to disclose the reason why he did it. 他拒绝透露他做那件事的原因。(why先行词是reason)
有时why可以省去。如：
That’s one of the reasons I asked you to come. 那是我要你来的原因之一。(reasons后省去why)
有时why可用that代替。如：
The reason that he died was lack of medical care. 他死于缺乏医疗。(why由that代替)