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1、主从复合句定义：两个句子，通过连词的连接，变成一个句子，该句子就叫做主从复合句构成复合句的两个句子中，一个叫主句，另一个叫从句意义：两件似乎毫不相关的事情，变得有联系格式：一般来说是主句在前从句在后若从句在前，从句后要添一个逗号，再写主句If引导的从句叫条件状语从句1.The weather is fine.2.We will go camping.3.If the weather is fine,we will go camping.4.We will go camping,if the weather is fine.because 引导的从句叫原因状语句.I got up late th
2、is morning.2.I was late for school this morning.3.I was late for school this morning because I got up late.4.I got up late this morning so I was late for school.误句：Because I got up late this morning,so I was late for school.so 引导的从句叫引导的从句叫结果状语从句while 与when引导的从句叫时间状语从句1.The boy was walking down the street.2.The UFO landed.3.The boy was walking down the street when the UFO landed.4.While the boy was walking down the street,the UFO landed.误句：while the boy was walking down the street,when the UFO landed.