3．“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，关系代词指人时用whom，指物时用which，不能用that。

　　1)某些带有介词的动词短语，介词可以提至关系代词之前，但是在一些固定搭配的短语动词中，由于动词和介词不可以分割，因此不能将介词置于关系代词之前，如take care of, look for, look after, care for等。

　　This is the book (which / that) I am looking for.

　　2)“介词＋关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词，有时数词或代词也可以放在“介词＋关系代词”之后。

　　He loved his parents deeply, both of whom are very kind to him.

　　＝He loved his parents deeply, of whom both are very kind to him.

　　3)介词＋which / whom＋to do结构可以改为：介词＋which / whom＋定语从句。

　　I don't have enough money with which to buy such an expensive dress.

　　＝I don't have enough money with which I can buy such an expensive dress.

　　4)在非限制性定语从句中，which可作定语，指先行词(短语或句子)所表示的信息，形成“介词＋which ＋名词”结构，相当于and in/at/during this/that＋名词。

　　He was very ill, in which case(＝and in this case)we sent him to hospital first.

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