由“介词+关系代词”引导的定语从句

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下载提示：英语语法是针对英语语言进行研究后，系统地总结归纳出来的一系列语言规则。英语语法的精髓在于掌握语言的使用。而且，英语语法是一套完整的语言知识体系。如果你想英语能够更进一步，英语语法就是其中的主要一环。

Download tips: English grammar is a series of language rules that are systematically summarized after studying the English language. The essence of English grammar lies in mastering the use of language. Moreover, English grammar is a complete language knowledge system. If you want English to go further, English grammar is the main link.

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1. 由“介词+关系代词”引导的定语从句主要用于正式文体，在非正式文体中通常将介词放至句末。如：This is the man to whom I referred. 我指的就是这个人。This is the man (whom) I referred to. 我指的就是这个人。

2. 直接用于介词后作宾语的关系代词which不能换成that，直接用于介词后作宾语的关系代词whom不能换成who。但若介词用于句末，则用作宾语的which, whom也可换成that, who，或者省略不同。如：这是一个我们讨论了许多的问题。This is a subject about which we have talked a lot.(which不能换成that，也不能省略)This is a subject which we have talked about a lot. 这是一个我们讨论了许多的问题。(which可以换成that，也可以省略)

3. 关系副词when, where, why根据情况有时可换成“介词+关系代词which”。如： That is the day when [=on which] he was born. 那就是他出生的日子。That is the house where [=in which] he lived. 那就是他住过的房子。That is the reason why [=for which] he must apologize. 那就是他必须道歉的原因。

4. 在很正式的文体中，“介词+关系代词”引导的定语从句可紧缩成“介词+关系代词+不定式”结构。如：在那儿孩子们有个玩耍的花园。正：There the children had a garden in which to play. (很正式)正：There the children had a garden in which they could play. (较正式)正：There the children had a garden to play in. (较口语化)注：这类“介词+关系代词++不定式”结构中的介词不能没有，也不能放在句末。如不能说There the children had a garden which to play in.

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