1. 關系代詞有：that,which,who,whom,whose,在定語從句中作主語、賓語中表語，whose作定語。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，在定語從句中作主語)
That is the person(whom/who/that) you want to see.(whom,who,that代人，在定語從句中作賓語，可省略)
Im not the fool(that) you thought me to be.(that代人，在定從中作表語)
A dictionary is a useful book which(=that) tells us the meaning of words(which或that代物，在定從中作主語)
2. 關系副詞有：when(指時間)，where(指地點),why(指原因)，在定語從句中作狀語。
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：不是表時間的先行詞都用when引導定從，不是表地點的先行詞都用where引導定從。例如：Well visit the factory which(=that) makes radios.
(which或that在定從中作主語，where不可用主語，故不可用)
They still remember the happy days(which/that) they spent in Beidaihe.
(which或that在定從中作spent的賓語，when不可作賓語，故不可用)
定語從句引導詞及用法
引導定語從句的關聯詞稱為關係詞，關係詞有關系代詞和關系副詞。關系代詞有that, which, who, whom, whose, as等；關系副詞有where, when, why等。關係詞常有3個作用：
1、引導定語從句。
2、代替先行詞。
3、在定語從句中擔當一個成分。
關系副詞引導的定語從句
1. when指時間，在定語從句中做時間狀語
(1) I still remember the day when I first came to the school.
(2) The time when we got together finally came.
2. where指地點，在定語從句中做地點狀語
(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，在定語從句中做原因狀語
(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：關系副詞引導的從句可以由“介詞+關系代詞”引導的從句替換
(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.
1. 關系代詞有：that,which,who,whom,whose,在定語從句中作主語、賓語中表語，whose作定語。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，在定語從句中作主語)
That is the person(whom/who/that) you want to see.(whom,who,that代人，在定語從句中作賓語，可省略)
Im not the fool(that) you thought me to be.(that代人，在定從中作表語)
A dictionary is a useful book which(=that) tells us the meaning of words(which或that代物，在定從中作主語)
2. 關系副詞有：when(指時間)，where(指地點),why(指原因)，在定語從句中作狀語。
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：不是表時間的先行詞都用when引導定從，不是表地點的先行詞都用where引導定從。例如：Well visit the factory which(=that) makes radios.
(which或that在定從中作主語，where不可用主語，故不可用)
They still remember the happy days(which/that) they spent in Beidaihe.
(which或that在定從中作spent的賓語，when不可作賓語，故不可用)
定語從句引導詞及用法
引導定語從句的關聯詞稱為關係詞，關係詞有關系代詞和關系副詞。關系代詞有that, which, who, whom, whose, as等；關系副詞有where, when, why等。關係詞常有3個作用：
1、引導定語從句。
2、代替先行詞。
3、在定語從句中擔當一個成分。
關系副詞引導的定語從句
1. when指時間，在定語從句中做時間狀語
(1) I still remember the day when I first came to the school.
(2) The time when we got together finally came.
2. where指地點，在定語從句中做地點狀語
(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，在定語從句中做原因狀語
(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：關系副詞引導的從句可以由“介詞+關系代詞”引導的從句替換
(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.