定语从句一、定语从句及相关术语1.定语从句：修饰一个名词或代词的从句称为定语从句，一般紧跟在它所修饰的先行词后面。2.关系词：引导定语从句的关联词成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。二.关系代词引导的定语从句1.who 指人，在从句中做主语(1) The boys who are playing football are from ClassOne.(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/whomyou 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 isliked by most boys.(2) This is the pen (which) he bought yesterday.4. that 指人时，相当于who 或者 whom ；指物时，相当于which 。在宾语从句中做主语或者宾语，做宾语时可省略。(5) The number of the people that/whocome to visit the city each year rises one million.(6) Where is the man that/whomI saw this morning?5. whose 通常指人，也可指物，在定语从句中做定语.对主句先行词的所属性进行修饰的。(1) He has a friend whose father is a doctor.(2) I once lived in a house whose roof has fallen in. whose指物时，常用以下结构来代替(3) The classroom whose door is broken will soon be repaired.(4) The classroom the door of which is broken will soon be repaired.(5) Do you like the book whose cover is yellow?(6) Do you like the book the color of which is yellow?*三.介词 +关系代词引导的定语从句关系代词在定语从句中做介词宾语时，从句常由介词+关系代词引导(1) The school (that/which)he once studied in is very famous.(2) The school in which he once studied is ...
