This is the house to which we paid a visit last month .
2. 介词的选择。
定语从句由“介词 ＋ 关系代词”引导时，介词的选择受上下文的制约。在结合语意的基础上，可以从下面几个角度判断该用什么介词。
★ 看先行词与哪一个介词是习惯“介 ＋ 名 ” 搭配的。如：
This is the factory in which he works . ( in the factory 在工厂）
This is the farm on which he works .（ on the farm 在农场）
★ 看定语从句中的动词是与哪一个介词形成习惯“动 ＋ 介 ”搭配。如：
The car on which he spent 40,000 yuan is made in N anjing . (spend money on sth .)
The car for which he paid 40,000 yuan is made in Nanjing . (pay money for sth .)
★ 既要看定语从句中的动词，又要看先行词有何习惯“动 ＋ 介 ＋ 名”搭配。如：
I don\'t know the student with whom Mary quarreled yesterday . (quarrel with sb .)
I don\'t know the thing about which they quarreled yesterday . (quarrel about sth . )
3. “介词 ＋ 关系代词”的复杂化
★ 复合介词 ＋ 关系代词
关系代词之前除了能用简单介词外，也能用复合介词。如：
Tom studies in a new school , at the back of which there is a big river .
She gave a friendly smile to the worker , in front of whom sat a little cat .
★ 名词（〈不定〉代词、数词、形容词最高级）＋ of ＋ 关系代词
例如： I live in an old house , whose door is made of bamboo .
注意：“ whose ＋名词”常可换成“名词 ＋ of ＋ 关系代词( whom / which )”上句可改成：
I live in an old house , whose door is made of bamboo .
She has two sons , neither of whom is tall .
In our class there are fifty students , most of whom are good at English .
I talked with an old worker , one of whose daughters is a scientist .
China has thousands of rivers , the longest of which is the Changjiang River .
二、whose 引导的定语从句
whose 是英语中唯一能够在定语从句中充当定语的一个关系代词，意为“……的”。它既可引导限制性定语从句，也可引导非限制性定语从句。与that , whom , which 又有着截然不同的用法。同学们须认真掌握，其主要用法如下：
1. 指人。
Do you know the boy whose brother is a postman ?
This is the student whose handwriting is the best in our school .
2. 指物。
The lives in a small room , whose windows face the north .
I want to buy the coat whose colour is the lightest .
注意：(1) whose 指人时，一般可以和 of whom 互换。
Do you know the boy , the brother of whom is a postman ?
This is the student , the handwriting of whom is the best in our school .
(2) whose 指物时，一般可以和 of which 互换。
He lives in a room , the windows of which face the north .
I want to buy the coat , the colour of which is the lightest .
3. whose 引导的定语从句作主语的定语时，一般不用 of which / whom来替换。
Mr Li , whose car was stolen last week , got very angry .
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高二英语第十四单元Satellites（卫星）