介词加which例子 介词which结构里的介词怎么确定

大家都知道在定语从句中，有的时候where，why，when可以换成“介词 which”结构，可是很多同学不明白这个结构里的介词是怎么来的。今天我们一起挖一挖，这个介词的由来。

首先我们要搞清楚，这个介词的原来位置不是在which前面，它原本是放在从句中的。它应该和从句中的动词形成一个短语、固定搭配或习惯用法等。

例1：Lili's dream is to have her own garden ______ to grow plenty of flowers.

A. that B. by which C. which D. in which

解析：答案选的是D。这个从句是省略结构。从句和先行词garden连起来：to grow plenty of flowers in her own garden.把从句和先行词连起来需要一个介词in。而介词in可以提前到which前面，就形成了in which结构。

例2：While driving through the city, she showed me the building ______ she once worked as a lift operator.

A. when B. which C. in which D. by which

解析：答案选C。先行词是building，把从句和先行词连起来。She once worked in the building as a lift operator.所以，就有了in which。

例3：The man ___________ you talked is my English teacher.

A. to who B. with who C. with whom D. that

解析：答案选C。把从句和先行词连起来：You talked with the man. 而且the man是介词with的宾语，所以用宾格whom。

例4：Eric received training in computer for one year, _____ he found a job in a big company.

A. after this B. after that C. after it D. after which

解析：答案选D。which代指前面一整句话。把从句变为主句是这样的：He found a job in a big company after Eric received training in computer for one year.所以就有了after which。

大家明白了吗？介词其实很好确定，只要把从句和先行词连一下，就很容易看出需要的介词了。希望可以帮到大家。

如有问题请留言。