for which的用法

Question

He owned a farm about twenty miles outside the city of Washington,for which the village of Georgetown was the market center.

Answer 1

首先，英语中有一个规定就是一般不会在句尾放介词（介词后面一定有名词）。所以在碰到从句的时候，特别是which或者that所指代的词在从句中视作为介词后面的名词出现的时候，就必须用which，并将介词前置。

which在这里是指代那个the city of Washington的，后面的从句的应该写成the village of Georgetwon was the market center for the city of Washington。

明白了吗？给你举个例子

His first job is in a big bank, from which he learnt a lot of information about financial management.

which是指代bank的，后面的从句是说he learnt a lot of information about financial management FROM the BANK.

所以不存在for which的用法，只是介词加which的用法。