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1、介词+关系代词”引导的定语从句介词 + 关系代词”引导的定语从句介词加关系代词引导的定语从句要注意以下几点:1“介词 + 关系代词引导的定语从句时,介词的宾语只能用which（指物)和whom（指人）,即：介词+which/whom.不能用that 和who。e。g。 This is the teacher from whom weve learned a lot。 这就是从他那里我们学了很多东西的老师.Great changes have taken place in the city in which we live. 我们所居住的城市发生了巨大的变化.2有时介词也可放在从句的末尾，这时关
2、系代词可用which/that（指物）,who/whom/that（指人）,也可以省略。e.g. The situation (which/that ) we had got into was very dangerous。 我们当时的处境很危险。The man (whom/who/that) you were talking to just now is my English teacher. 你刚刚和他谈话的那个人是我的英语老师。3当定语从句中的谓语动词短语是固定搭配,不可分割时,那么动词短语中的介词不能前置。e.g。 This is the pen which Im looking fo
3、r. 这是我正在找的那支钢笔.不能写成：This is the pen for which Im looking.4定语从句也可由“名词/代词/数词+介词+which/whom引出。e。g. That old man has two sons， one of whom is a doctor. 那个老人有两个儿子，其中一个是医生.The house, the windows of which ( = whose windows = of which the windows） were damaged， has now been repaired. 窗子遭破坏的那栋房子现在已经修好了。5引导定语
4、从句的关系副词（when, where， why） 可以用“介词+关系代词”代替.e。g。 Ill never forget the day when I joined the party。 （when= on which）. 我永远都不会忘记入党的日子。The factory where my father works is in the east of the city. （where = in which）. 父亲工作的那家工厂在城东。None of us know the reason why Tom was absent from the meeting。 (why = for which）。 我们都不知道汤姆缺席会议的原因。6“复合介词短语+which”引导的定语从句,常与先行词用逗号隔开,而且定语从句常用倒装语序.e。g。 He lived in a big house, in front of which stood a big tall tree. 他住在一幢大房子里，房前有一棵大树.