当定语从句引导词作介词的宾语时，可以将介词提到引导词前，以强调介词和引导词的介宾关系;介词+which / whom在从句中作状语或定语;有些情况下，介词+which相当于where / when / why。如：
____The man with whom you talked is an expert in earthquakes.____(with whom在从句中作状语修饰谓语动词talked)
____That’s the gate at which the young woman was picked up by some strangers.____(at which=where, 在从句中作状语修饰谓语动词was picked up)
____The day on which Nelson Mandela helped me was one of my happiest.____(on which=when，在从句中作状语修饰谓语动词helped)
____I can’t tell you the reason for which she insists on doing that.____(for which=why，在从句中作状语修饰谓语动词insists)
____The shelters took in thousands of flood survivors, many of whom / of whom many suffered from malaria.____(of whom在从句中作定语修饰many)
____The house of which the windows / the windows of which are open was broken into by burglars. ____(of which在从句中修饰定语the windows) = The house whose windows are open was broken…
5) 定语从句的分类：
(1) 限定定语从句：
起着界定先行词的身份，而不至与同类人或事物混淆的定语从句，一般不用逗号和主句隔开。如：
One of my brothers who is in the army now used to be an art student. 我一个现在当兵的兄弟学过艺术。(定语从句界定one of my brothers的身份：有多个兄弟，这里指的是当兵的兄弟)
The travellers who had already been informed about the flood stopped their journey. 那些已经获悉洪灾的路人暂停了行程。(只有获悉洪灾的路人才终止了行程，没有获悉洪灾的路人并没有暂停其行程。)
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