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四. 介词+which/ whom引导的定语从句 1. 介词的选用原则： 根据定语从句谓语动词的习惯搭配来决定。 This is the book on which I spent 8 dollars. This is the book for which I paid 8 dollars. 四. “介词+which/whom”引导的从句， 1.介词选用原则 (2) 根据先行词的习惯搭配来决定。 I remember the day on which I joined the Party. I remember the days during which I lived there. 2. 当介词放在关系代词前面时，关系代词只能用whom(指人)或which(指物)，且关系代词不能省略。 The man with whom you talked just now is my neighbor. I can’t find the pen with which I was writing . 2. 介词位于关系代词前，关系代词的使用 3. 当介词位于定语从句末尾时，可用 which/that(指物), who/whom/that(指人)作从句中介词的宾语.而且作介词宾语的关系代词可以省略。 (whom/who/that) (which/that) Dad is a person________________ I can easily talk to. Is this the play ___________ you were talking about just now? 3. 介词位于句末，关系代词的使用 4. 在一些固定搭配的动词短语中，由于动词和介词不可分割，因此不能把介词置于关系代词之前。如： This is the watch (that/ which) I am looking for. The babies (who/ whom/ that) the nurse is looking after are very healthy. 4. 含介词的固定搭配动词短语的使用 | 
