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1 定语从句
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2 虚拟语气
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3 倒装句&强调句
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4 词汇填空题
第五节 定语从句
定语从句，一个简单句跟在一名词或代词后（先行词）进行修饰限定，就叫做定语从句。在主句中充当定语成分。被修饰的词叫先行词。定语从句不同于单词作定语的情况，它通常只能放在被修饰的词（即先行词）之后。定语从句由关系词（关系代词、关系副词）引导，关系代词、关系副词位于定语从句句首。
定语从句分为限制性定语从句和非限制性定语从句。限制性定语从句是先行词不可或缺的部分，去掉后主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开。如：
The novel which you are carrying is about to drop down.(限制性定语从句)
This novel,,which I have read three times,,is very touching.(非限制性定语从句)
一、定语从句的引导词
1.先行词是人，且在从句中作主语时，用关系代词who/that;在从句中作宾语时，用who/whom/that,或者省略。如：
The man who/that stands there is my uncle.
2.先行词是物，可用关系代词which/that充当从句中的主语和宾语，作宾语时可省略。如：
My favorite place is Kunming which/that is called as the Spring City.
3.先行词是人或物，且在从句中作定语时，用whose引导，相当于先行词的所有格，whose也可以替换成of which(指物)或of whom(指人)。如：
A man shouted at a driver whose/of whom car was blocking the street.
4.先行词是时间、地点、原因，且在从句中作状语时，分别用关系副词when,where,.why引导。如：
Beijing is the place where/in which I was born.
二、非限制性定语从句
非限制性定语从句关系词与限制性定语从句关系词的主要区别：
非限制性定语从句的关系词有which,whom,as等，不可省略；
whom在非限制性定语从句中作宾语时不可用who来代替；
非限制性定语从句的先行词也可为整个主句，此时非限制性定语从句常由which引导，还可用in which case,at which point,,on which occasion等（从句谓语动词要用第三人称单数）。
以下举出例子说明：
A young man had a new girl friend,whom he wanted to impress.(这里不能用who)
The weather turned out to be very good,which was more than we could expect.
Keys: DDADD
