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十二定语从句
语法精讲在复合句中修饰名词或代词的从句叫定语从句。被修饰的名词或代词叫先行词。引导定语从句的关系代词有who, whom, whose, which, that等和关系副词where, when, why等。关系代词和关系副词在定语从句中担任句子成分。
注意：1. 关系代词在从句中做主语时，从句的谓语动词的人称和数必须和先行词保持一致。
2. 关系代词who, which, that 在限定性定语从句中做动词宾语或介词宾语，而该介词又位于从句末尾时，经常省略，但 as一般不省
that既可指人，又可指物，在定语从句中可做主语，宾语（可省略）
This is the first sum of money (that) the children’s family has received.
This is not the only apple that has rotten away.
Who that knows him would believe him?
He’s changed. He’s not the man that he was.
I’ll never forget the day that/which we spent together in the countryside.
下列情况下，往往在下面几种情况下只用that引导定语从句：
A. 先行词是不定代词：all, few, little, much, something, nothing, anything等。例如：
All that we have to do is to practise every day.
B. 先行词被序数词或形容词最高级所修饰。例如：
The first lesson that l learned will never be forgotten.
C. 先行词被all, any, every, few, little, no, some修饰时。例如：
l have read all the books (that) you gave me.
D. 先行词被the only, the very, the same, the last修饰时。例如：
