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) I will never forget the day, when I joined the Party. —I will never forget the day, on which I joi...
