定语从句的介词怎么选 介词+which或that

要首先确定定语从句中先行词与从句中谓语动词之间的关系，可以在脑海中构思出一个简单句，如：He talked with our English teacher. 这个句子中our English teacher将有一个先行词指代，而takled和our English teacher之间用with，所以定语从句可能为He is the person with whom our English teacher talked. 又如简单句The car belongs to an awful woman. 定语从句可能为Jim doesn't like the woman to whom the car belongs.有时候先行词在定语从句中归属于一个状语短语，如She covered a distance of eight miles during that time at which she was alone.这句话中，that time归属于at that time,在句中作时间状语，即She was alone at that time. 又如This sentence was written by the student.定语从句可能为The student by whom the sentence was written is hard-working.

“介词+关系词”结构中介词的来源
⑴ 先行词的习惯搭配或者根据先行词的搭配需要。
The speed at which light travels is 300.000 km per second.
The room in which there is a blackboard is their classroom.
⑵从句中谓语动词的习惯搭配或者搭配需要。
Don’t bring children to see …the animals of which they are afraid.
This is the job at which laughed.
⑶表示所有关系或者整体的一部分，常用of which.
China has hundreds of islands, the largest of which is *.
8）“介词+which/who+动词不定式”结构
The poor man has no house in which he can live.
= The poor man has no house which he can live in.
= The poor man has no house in which to live.
= The poor man has no house to live in.
The beggar has no money that he can buy food with.
= The beggar has no money with which to buy food.
=The beggar has no money to buy food with.

介词后只能加which 表示物或whom表示人.
This is the city in which/where I worked ten years ago.
The man with whom my father is talking is my teacher.

注意介词不能与that搭配,在定语从句当中.介词的选择要看先行词在定语从句当中的角色.譬如
i don't like the way in which he talked to his mother. 之所以选择in,是因为定语从句原为he talked to his mother in the way.
再例如, i will never forget the day on which he left Beijing. 定语从句原为 He left Bejing on the day.