高考英语语法口诀（七）：巧学定语从句
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由两个简单句合并成一个含定语从句的复句时，对于关系代词、关系副词的取舍是个难点。如下两句话，用起来倒方便，快捷：
代代代①，副代副②;
有介要用代③，无介关副代④。
说明：①是说用关系代词代替定语从句中的代词或名词。即将两个句子合并成定语从句时，在确定先行词后(在主句中)，把另一个句子(定语从句)中的代词或名词用关系代词代替，紧跟在先行词之后即可。这里当然要记住，应把被代替的代词或名词去掉。
eg: The teacher is my brother.
He is teaching.
→The teacher who (代替代词he, 故也须将he去掉)is teaching is my brother.
②与①同理。即用关系副词代替定语从句中的副词(或作状语的介词短语)。这时的关系副词也照样紧跟在先行词之后。eg:
We visited the factory.
She worked in the factory last year.
→We visited the factory, Where (代替相当于副词作状语的介词词组in the factory) she worked last year.
③和④两句是指如果定语从句中有作状语的介词短语，保留介词就要用关系代词，或用关系副词代替整个介词短语。 eg:
I still remember that day.
I joined the Party on that day.
→I still remember the day on which I joined the Party.
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