定语从句是在复合句中修饰某一名词或代词的从句。被修饰的名词或代词叫做选行词whose引导的定语从句，
而引导定语从句的词叫引导词，有关系代词和关系副词两类。
懂得什么样的先行词后用什么样的引导词是学好定语从句的关键。
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)
I´m 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：We´ll 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)。
定语从句是在复合句中修饰某一名词或代词的从句。被修饰的名词或代词叫做选行词，
而引导定语从句的词叫引导词，有关系代词和关系副词两类。
懂得什么样的先行词后用什么样的引导词是学好定语从句的关键。
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)
I´m 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：We´ll 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)。
