例子是who[人],whose[人],which[事物],that[人事物]，像英语的「Grigori Perelman is the Russian mathematician who refused his Fields Medal」(意即「格里戈里·佩雷尔曼是拒绝领取他的菲尔兹奖的俄罗斯数学家」)这句即为其一个例子，在此例中，「who refused his Fields Medal」是一个修饰名词片语「the Russian mathematician」(俄罗斯数学家)的关系子句，而who则是标明关