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句子变换，就是通过扩展或缩减的方法只改变句子结构而不改变句子原意。掌握这种方法，有助于考生学会理解结构不同而意义相同的句子和用不同的句子结构来表达相同的意思，从而达到提到读和写的能力。
1、简单句和并列句的互换
（1）简单句变为并列句
根据句子的含义将简单句中的一个短语扩展为一个分句，用并列连词连接，使之成为并列句。
A、介词短语扩展为分句
In spite ofour search,we could not find the book.
We searched for the book，butwe could not find it.
After studying hard，Tom passed the exam.
Tom studied hard andpassed the exam.
B、不定式短语扩展为分句
You must do exercise every day to keep you healthy.
You must do exercise every day，or you won"t keep you healthy.
The light was too dimto be used for close work.
The light was very dim and so it cannot be used for close work.
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