定语从句英语例句的意思是：修饰名词或代词的从句。
定语从句：修饰名词或代词的从句。换句话说，名词、代词后的从句叫定语从句。先行词：被定语从句修饰的名词、代词、甚至词组或句子叫先行词。关系词：引导定语从句的词叫关系词。关系代词：在定语从句中担任主、宾、表、定语咸分。关系副词：在定语从句中担任状语成分。
关系词3个功能：
1、连接功能（连接先行词与定语从句）。
2、担任功能（在定语从句中担任主、宾、表、定、状语）。
3、替代功能（在定语从句中代替先行词）。
关系代词在定语从句中充当：
主语的是：who,that,which.
宾语的是：who,whom,that,which.
定语的是：whose,which.
英语从句：
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 man who lost his way.
2、whom.指人，在定语从句中充当宾语，常可省略。
(1) Mr. Liu is the person (whom) you talked about on the bus.
(2) Mr. Ling is just the boy whom I want to see.
注意：关系代词whom在口语和非正式语体中常用who代替，可省略。
(3) The man who/whom you met just now is my friend.
3、which.指物，在定语从句中做主语或者宾语，做宾语时可省略。
(1) Football is a game which is liked by most boys.
(2) This is the pen (which) he bought yesterday.