定语从句无论在语法填空、短文改错还是书面表达中都是必然会涉及的考点，掌握好定语从句，对加深阅读和完形填空的篇章理解都是大有裨益的。
命题趋势：考点集中在关系代词(that, which，who)及关系副词(when, where)的用法上。
考点一 关系代词引导的定语从句
1．who，whom，whose引导的定语从句
①Some people who are successful language learners often fail in other fields.
有些在语言学习上很有成就的人，在其他领域常常一事无成。
②I have many friends to whom I'm going to send post cards.
我有很多朋友，我将寄明信片给他们。
③Children who are not active or whose diet is high in fat will gain weight quickly.
很少进行体育锻炼或饮食富含脂肪的孩子体重会增加很快。
[规律总结]
(1)who和whom指人，who在定语从句中作主语或宾语；whom在定语从句中作宾语，在限制性定语从句中可省略。在口语中可用who代替whom。
(2)whose指人或物，在定语从句中作定语，指物时常可用of which取代。
2．that，which引导定语从句
①All the people that come from the country work much harder.
所有来自农村的人工作都努力得多。
②The first place that they visited in Guilin was Elephant Trunk Hill.
在桂林他们参观的第一个地方是象鼻山。
