定语从句知识总结8篇 2.关系词：引导定语从句的关联词称为关系词关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等;关系副词有where, when, why等。关系词常有3个作用：1，引导定语从句。2，代替先行词。3，在定语从句中担当一个成分。1.who指人，在从句中做主语(1)The boys who are playing football are from Class One.(2)Yesterday I helped an old
