第二章-复合句（二）二、定语从句This is the pen （which/that） he bought yesterday.（关系代词指代先行词物体pen，在句子中作宾语。）I lived in a house whose roof has fallen in =I lived in a house the roof of which has fallen in.（关系代词指代先行词物体house，在从句中作定语，所以用所有格形式。）由“介词+关系代词”引导的定语从句。当关系代词在定语从句中作介词宾语时，通常用“介词+关系代词”的形式，此时关系代词只能是which，whom,whose.关系代词that和who不能作介词宾语，介词的确定取决于上下文的意思。This is the farm on which his father works.The residents, all of whom had been damaged by the fire, were given help by the Red Cross.2.关系副词引导的定
