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1. 关系代词有：that，which，who，whom，whose，在定语从句中作主语、宾语中表语，whose作定语。代人的有：who，whom，whose，that代物的有：that，which，whose.例如：

The man who helped you is Mr White.(who代人，在定语从句中作主语)

That is the person(whom/who/that) you want to see.(whom，who，that代人，在定语从句中作宾语，可省略)

Im not the fool(that) you thought me to be.(that代人，在定从中作表语)

A dictionary is a useful book which(=that) tells us the meaning of words(which或that代物，在定从中作主语)

2. 关系副词有：when(指时间)，where(指地点)，why(指原因)，在定语从句中作状语。

例如：Would you suggest a time(when) we can have a talk?(when可省略)

The house where they live is not very large./This is the reason why he did not came to the meeting.

注意：不是表时间的先行词都用when引导定从，不是表地点的先行词都用where引导定从。例如：Well visit the factory which(=that) makes radios.

(which或that在定从中作主语，where不可用主语，故不可用)

They still remember the happy days(which/that) they spent in Beidaihe.

(which或that在定从中作spent的宾语，when不可作宾语，故不可用)

定语从句引导词及用法

引导定语从句的关联词称为关系词，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。

关系副词引导的定语从句

1. when指时间，在定语从句中做时间状语

(1) I still remember the day when I first came to the school.

(2) The time when we got together finally came.

2. where指地点，在定语从句中做地点状语

(1) Shanghai is the city where I was born.

(2) The house where I lived ten years ago has been pulled down.

3. why指原因，在定语从句中做原因状语

(1) Please tell me the reason why you missed the plane.

(2) I don’t know the reason why he looks unhappy today.

注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换

(1) The reason why/ for which he refused the invitation is not clear

(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.

(3) Great changes have taken place in the city in which./where I was born.

本文到此结束，希望对大家有所帮助。