关系副词的意思相当于“介词
+which结构”，在定语从句中做状语的成分。

拆分法分析几个句子，如下：
1.He will always remember the day when/on which his father returned from America.
他将永远记得父亲从美国返回的那一天
拆分后：
He will always remember the day. His father returned from America on the day..
2.This was the time when/at
which she left for Beijing.
这就是她动身去北京的时间。

拆分后
This was the time.
She left for beijing at the time.
3.I don't know the
reason why/for which he didn't come to the meeting yesterday morning.
我不知道他为什么没有参加昨天上午的会议。

I don't know the reason.
He didn't come to the meeting yesterday morning for the reason.
重要提示：在when、where、why
关系副词引导的英语定语从句中，只
会出现when、where、why或on which、at which、for which等等，绝对不会出现on when、at where、for why 这种情况，因为关系副词引导的定语从句只能起状语作用，既不能做动词的宾语，也不能做介词的宾语。

选出正确的定语从句
1、
A.The man is said to come from a town where nobody knew.
B.The man is said to come from a town which nobody knew.
2、
A.That is the age in when people live in peace and happiness.
B.That is the age in which people live in peace and happiness.。