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【大学英语四级考点七：】 “介词＋关系代词”引导的定语从句
1．在“介词＋关系代词”结构中，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose。
The person to whom you"ll write is Mr Ball.
The old man was talking with Mr Smith，in whose hospital I was operated on.
2．“介词＋关系代词”前可有some，any，none，both，all，neither，most，each，few等代词及名词、数词等。
He has two sons，both of whom were killed in the war.
I live in a house，the window of which faces the south.
3．“介词＋关系代词＋to do”为省略形式，可以转化为“介词＋关系代词＋句子”的形式。
The poor man had no house in which to live.＝The poor man had no house in which he could live.
4．“介词＋关系代词”结构中介词的选择可根据定语从句中谓语动词和介词的习惯搭配、先行词和介词的习惯搭配来确定，有时也需要结合句意。
In the street there wasn"t any person to whom she could turn for help.
The boss in whose company my father worked is a very kind person.
5．from where 虽为“介词＋关系副词”结构，但也可引导定语从句，where往往指代前面的表示具体位置的介词短语。
He stood on top of the hill，from where he could see the whole village.(where指代on top of the hill，指的是“从山顶那个地方看”，而不是指“山”)
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