当关系代词在定语从句中作介词宾语时，我们通常用“介词＋关系代词”引导定语从句。如果指“人”，用“介词＋whom”；如果指“物”，用“介词＋which”。
使用“介词＋关系代词”要注意以下几点：
(1) 根据定语从句中谓语动词的搭配习惯(即固定短语)。
(2) 根据先行词的搭配习惯(约定俗成，不一定是短语)。
(3) 根据句子的意思来选择。
(4) 表示“所有”关系或“整体中的一部分”时，通常用介词of。
关系构成
关系从句的句法功能主要是充当定语。在英语中，关系从句通常位于它所修饰的词（组）之后。被关系从句修饰的词（组）叫做先行词（英语：antecedent），引导关系从句的词称为关系词，关系词指代先行词并在关系从句中充当一定的成分。
关系从句有限制性关系从句和非限制性关系从句之分。限制性关系从句起限定作用，修饰特定的名词或名词短语；而非限制性关系从句只起补充说明某种信息的作用。
以上内容参考：百度百科-定语从句
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第1个回答 2016-04-28
在定语从句中，当先行词在从句中做介词的宾语时，可以使用“介词+关系代词”的形式。
这时关系代词不能用that，而要用which.
如：Tom took away the book for which Jerry is looking. 汤姆拿走了杰利正在找的书。
这时关系代词不能用that，而要用which.
如：Tom took away the book for which Jerry is looking. 汤姆拿走了杰利正在找的书。
第2个回答 2016-05-17
一、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。
二、关系词：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。
三、关系代词引导的定语从句
1、who指人，在从句中做主语
2、whom指人，在定语从句中充当宾语，常可省略。 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、which指物，在定语从句中做主语或者宾语，做宾语时可省略most boys.
如果在从句中做宾语,就用whom或who.如果是在从句中作主语就只能用who.
4、that指人时，相当于who或者whom;指物时，相当于which。在定语从句中做主语或者宾语，做宾语时可省略。
5、 whose通常指人，也可指物，在定语从句中做定语
四、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. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等
2.
若介词放在关系代词前，关系代词指人时用whom，不可用who或者that;指物时用which，不能用that;关系代词是所有格时用whose
3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each,
few等代词或者数词
二、关系词：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。
三、关系代词引导的定语从句
1、who指人，在从句中做主语
2、whom指人，在定语从句中充当宾语，常可省略。 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、which指物，在定语从句中做主语或者宾语，做宾语时可省略most boys.
如果在从句中做宾语,就用whom或who.如果是在从句中作主语就只能用who.
4、that指人时，相当于who或者whom;指物时，相当于which。在定语从句中做主语或者宾语，做宾语时可省略。
5、 whose通常指人，也可指物，在定语从句中做定语
四、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. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等
2.
若介词放在关系代词前，关系代词指人时用whom，不可用who或者that;指物时用which，不能用that;关系代词是所有格时用whose
3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each,
few等代词或者数词
第3个回答 推荐于2017-11-22
例如：in which =where
而且介词只能用which不能用that
精锐五角场本回答被提问者采纳
而且介词只能用which不能用that
精锐五角场本回答被提问者采纳
第4个回答 推荐于2018-03-11
一、“介词＋关系代词”的用法
当关系代词在定语从句中作介词宾语时，我们通常用“介词＋关系代词”引导定语从句。如果指“人”，用“介词＋whom”；如果指“物”，用“介词＋which”。例如：
Do you know the lady with whom our manageris talking in the office?
Where is the supermarket in which youbought the laptop last week?
使用“介词＋关系代词”要注意以下几点：
(一)选用介词的依据：
(1) 根据定语从句中谓语动词的搭配习惯(即固定短语)。例如：
Yesterday we visited the West Lake forwhich Hangzhou is famous.
(2) 根据先行词的搭配习惯(约定俗成，不一定是短语)。例如：
The old woman with whom you talked just nowis a famous artist.
(3) 根据句子的意思来选择。例如：
The naughty boy made a hole in the wallthrough which he could see what is happening outside.
(4) 表示“所有”关系或“整体中的一部分”时，通常用介词of。例如：
I have about 20 books, half of which were writtenby Bing Xin, the famous writer.
(二)在定语从句中，含介词的短语动词不可拆开使用(短语拆开后含义发生变化)，如look after, look for等。例如：
The babies whom the nurses are lookingafter are very healthy.(正)
The babies after whom the nurses arelooking are very healthy.(误)
(三)“of which /whom”有时可以用“whose＋名词”结构来改写。例如：
The building whose roof was damaged in theearthquake has been repaired.
＝The building of which the roof was damaged in the earthquake hasbeen repaired.
(四)当先行词为way并且定语从句中缺少状语时，通常用in which或that引导定语从句(in which或that可省略)；如果定语从句中不缺少状语，则用关系代词引导(that 或which 可省略)。例如：
All of us disliked the way(in which /that)Tom settled the maths problem.
I don’t understand the way(that/which)theteacher explained to me.
(五)in that不可以引导定语从句，但可以引导原因状语从句。例如：
She didn’t attend the meeting in that /because she was seriously ill.
二、“介词＋关系代词”与关系副词的转化
(1)当先行词表示地点，定语从句中缺少地点状语时，通常用关系副词where引导，此时也可选用表示地点的介词＋which来代替关系副词where。例如：
I visited the village where many childrencouldn’t go to school because of poverty.
＝I visited the village in which many children couldn’t go toschool because of poverty.
(2) 当先行词表示时间，定语从句中缺少时间状语时，通常用关系副词when引导，此时也可选用表示时间的介词＋which来代替关系副词when。例如：
We’d better fix a date when we willpractice speaking English next week.
＝We’d better fix a date on which we will practice speaking Englishnext week.
(3) 当先行词为reason，定语从句中缺少表示原因状语时，通常用关系副词why引导，此时也可以用for which来代替关系副词why。例如：
Can you tell me the reason why you werelate for school?
＝Can you tell me the reason for which you were late for school?本回答被网友采纳
当关系代词在定语从句中作介词宾语时，我们通常用“介词＋关系代词”引导定语从句。如果指“人”，用“介词＋whom”；如果指“物”，用“介词＋which”。例如：
Do you know the lady with whom our manageris talking in the office?
Where is the supermarket in which youbought the laptop last week?
使用“介词＋关系代词”要注意以下几点：
(一)选用介词的依据：
(1) 根据定语从句中谓语动词的搭配习惯(即固定短语)。例如：
Yesterday we visited the West Lake forwhich Hangzhou is famous.
(2) 根据先行词的搭配习惯(约定俗成，不一定是短语)。例如：
The old woman with whom you talked just nowis a famous artist.
(3) 根据句子的意思来选择。例如：
The naughty boy made a hole in the wallthrough which he could see what is happening outside.
(4) 表示“所有”关系或“整体中的一部分”时，通常用介词of。例如：
I have about 20 books, half of which were writtenby Bing Xin, the famous writer.
(二)在定语从句中，含介词的短语动词不可拆开使用(短语拆开后含义发生变化)，如look after, look for等。例如：
The babies whom the nurses are lookingafter are very healthy.(正)
The babies after whom the nurses arelooking are very healthy.(误)
(三)“of which /whom”有时可以用“whose＋名词”结构来改写。例如：
The building whose roof was damaged in theearthquake has been repaired.
＝The building of which the roof was damaged in the earthquake hasbeen repaired.
(四)当先行词为way并且定语从句中缺少状语时，通常用in which或that引导定语从句(in which或that可省略)；如果定语从句中不缺少状语，则用关系代词引导(that 或which 可省略)。例如：
All of us disliked the way(in which /that)Tom settled the maths problem.
I don’t understand the way(that/which)theteacher explained to me.
(五)in that不可以引导定语从句，但可以引导原因状语从句。例如：
She didn’t attend the meeting in that /because she was seriously ill.
二、“介词＋关系代词”与关系副词的转化
(1)当先行词表示地点，定语从句中缺少地点状语时，通常用关系副词where引导，此时也可选用表示地点的介词＋which来代替关系副词where。例如：
I visited the village where many childrencouldn’t go to school because of poverty.
＝I visited the village in which many children couldn’t go toschool because of poverty.
(2) 当先行词表示时间，定语从句中缺少时间状语时，通常用关系副词when引导，此时也可选用表示时间的介词＋which来代替关系副词when。例如：
We’d better fix a date when we willpractice speaking English next week.
＝We’d better fix a date on which we will practice speaking Englishnext week.
(3) 当先行词为reason，定语从句中缺少表示原因状语时，通常用关系副词why引导，此时也可以用for which来代替关系副词why。例如：
Can you tell me the reason why you werelate for school?
＝Can you tell me the reason for which you were late for school?本回答被网友采纳
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