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一、基本概念 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。 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。 | 
