2015衛(wèi)生職稱英語考試語法之介詞+which（whom）引出的定語從句：

這種定語從句在修飾人時，介詞后只用whom，修飾物時只用which，而不用that.例如：

e.g.The man with whom I share the room is a young teacher fresh from college.

與我同屋的人是一位剛從大學畢業(yè)的青年教師。

（fresh from school 剛由學校畢業(yè)）

e.g.This is the shelf on which I keep my books.這是我放書的架子。

e.g.The famous economist of whom we have often heard will come to give us a lecture next Friday.

我們常聽說的那位經(jīng)濟學家下周五將給我們講課。

（hear of： 聽說 ）

（give a lecture： 講課，講演 ）

（attend a lecture 聽報告；上課）

注：

當介詞位于從句句末時，作為介詞賓語的which和whom則仍可改用that，也可省略，如上面最后兩句可改為；

This is the shelf （which或that）I keep my books on.

The famous economist（whom或that）we have often heard of will come to give us a lecture next Friday.