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定语从句中关系副词的用法 ■ 关系副词 when 的用法 when 既可引导限制性定语从句，又可引导非限制性定语从句。先行词是时间名词，在从句中充当时间状语，相当于“介词+which”。如： Can you tell me the time when the film will start? — Can you tell me the time at which the film will start? 请告诉我电影什么时候开始好吗？(限制性定语从句) http://yingyu.chazidian.com I will never forget the day, when I joined the Party. — I will never forget the day, on which I joined the Party. 我入党的那一天，我永远不会忘记。(非限制性定语从句) | 
