托福语法点睛之介词+关系代词引导的定语从句

### 介词+关系代词引导的定语从句 在介词后作宾语的关系代词只有 which 和 whom。如先行词是物，引导词用 which；如先行词是人，则引导词用whom。 一、看从句的动词选介词：所用介词需与定语从句中的动词构成固定搭配 例句1：The girl **with whom** you **work** is his girl friend. 例句2：The goals **for which** he had **fought** all his life no longer seemed important to him. 二、看从句的形容词选介词：所用介词需与定语从句中的形容词构成固定搭配 例句3：He referred me to some reference books **with which** I am not very **familiar**. 例句4：They will pass along their fresh impressions to the youth groups **in which** they are **active**. 三、看从句的名词选介词：所用介词需与定语从句中的名词构成固定搭配 例句5：I am sending you an inquiry, **to which** your prompt **attention** is highly appreciated. 四、看先行词选介词 这类情况，关系代词前面用什么介词与定语从句没有关系，而是与关系代词前面的先行词紧密相关，所选用的介词要与先行词构成固定搭配。 例句6：About a thousand species of animals are in danger of extinction, and **the rate at which** they are being destroyed has increased. 要想正确地使用介词，我们必须记住相关的介词短语搭配。常见的有：with ease，at the rate，in the direction，to the extent，to the degree，at the temperature，by the means，by the mode，in a culture，in practice 等等。