摘要：当关系代词作介词宾语.且该介词不是和从句的谓语动词构成固定短语时.介词可以提前.这样就出现“介词+关系代词 .先行词指物.用“介词+which .指人则用“介词+whom".且两个关系代词均不能省略.介词的选择要遵循两个原则:根据定语从句中谓语动词与先行词的搭配内容而定,根据先行词的特殊用法而定. [考例]Do you know the young lady your mother is talking? A. who B. whom C. with whom D. which [答案]:C [命题立意]:本题考查“介词+关系代词 引导定语从句的用法. [试题解析]:先行词为the young lady.被关系代词whom代替在从句中作talk with 的宾语.介词with 可以放在关系代词之前.故应选C. [语法回顾] 在复合句中.修饰某一名词或代词的从句叫做定语从句.定语从句所修饰的词叫做先行词.定语从句放在先行词的后面.引导定语从句的词叫做关系代词(that, which, who, whom, whose)或关系副词.关系代词和关系副词放在先行词与定语从句之间.起联系的作用.同时又作定语从句的一个成分. 关系代词.副词 作用 先行词 例句 that. who. whom 主语.宾 语.表语 人 Do you know the girl who／that is standing under a tree?你知道站在树下的女孩是谁吗? that.which 主语.宾 语.表语 物.时 间.地 点.原 因 She got a computer which／that her parents bought for her． 她有一台她的父母买给她的电脑. whose 定语 人物 The boy whose father is a doctor studies very hard．他的爸爸是医生的男孩学习非常刻苦. The classroom whose window is open is mine．窗户开着的那个教室是我的教室. when 状语 时间 I still remember the day when you leave for Beijing．我仍然记得你去北京的那一天. where 状语 地点 This is the school where my mother works．这就是我妈妈 工作的学校. why 状语 原因 Could you explain the reason why you were late?你能解释一下你迟到的原因吗?

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