在英语六级备考过程中，复合句的构建是提升写作和阅读理解能力的关键环节。本文将详细解析复合句构建的 “加减乘除” 四步法，并通过10组句式升级对比案例，帮助考生掌握这一技巧。
一、“加” 从句（时间 / 原因）
在句子中加入时间或原因从句，可以使句子更加丰富和具体。时间从句通常由when, while, as, before, after等引导，原因从句则常由because, since, as等引导。
学习方法：多读范文，注意其中时间或原因从句的使用，尝试模仿并写出相似的句子。
例句：
- 原句：I was reading a book. The phone rang.
- 升级句：I was reading a book when the phone rang.
二、“减” 冗余成分
冗余成分会使句子显得啰嗦，影响表达效果。要学会删除不必要的重复词汇或短语。
学习方法：写作后，仔细检查句子，删除重复或冗余的词汇。
例句：
- 原句：He is a man who is very kind.
- 升级句：He is a very kind man.
三、“乘” 逻辑连接词
使用逻辑连接词可以使句子之间的逻辑关系更加清晰，增强文章的连贯性。常见的逻辑连接词有and, but, so, because, although等。
学习方法：在写作中，注意使用逻辑连接词来连接句子，使文章更加流畅。
例句：
- 原句：He was late. He missed the meeting.
- 升级句：He was late, so he missed the meeting.
四、“除” 重复主语
避免在相邻句子中重复使用相同的主语，可以使句子更加简洁明了。
学习方法：在写作时，注意检查句子是否重复使用了主语，尝试使用代词或其他方式来替代。
例句：
- 原句：Tom is a teacher. Tom likes his job.
- 升级句：Tom is a teacher who likes his job.
总结
通过 “加减乘除” 四步法，考生可以有效地提升复合句的构建能力，使文章更加丰富、连贯和简洁。希望本文提供的10组句式升级对比案例能帮助考生更好地理解和掌握这一技巧。
附：10组句式升级对比案例
-
原句：She sings. She dances.
升级句：She sings and dances. -
原句：He is happy because he passed the exam.
升级句：He passed the exam, so he is happy. -
原句：The cat was sleeping. The dog was barking.
升级句：While the cat was sleeping, the dog was barking. -
原句：I like reading. My sister likes reading too.
升级句：Both my sister and I like reading. -
原句：He is a man. He is very smart.
升级句：He is a very smart man. -
原句：She went to the store. She bought some milk.
升级句：She went to the store and bought some milk. -
原句：He was late. He didn’t catch the bus.
升级句：He was late, so he didn’t catch the bus. -
原句：The book is interesting. I like it.
升级句：The book is interesting, so I like it. -
原句：He is tired. He needs to rest.
升级句：Being tired, he needs to rest. -
原句：She is a good student. She studies hard.
升级句：She is a good student who studies hard.
通过不断练习和应用这些技巧，考生一定能在英语六级考试中取得优异的成绩。
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