复合句指的是含有两个或更多的主谓结构的句子, 其中有一个(或更多)主谓结构充当句子的某一(些)成分, 如主语, 宾语, 表语, 定语, 状语, 同位语等。
除了主句以外，它有主语从句，宾语从句，表语从句，同位语从句，定语从句，和状语从句。主句和从句之间由从属连词连接。
一、主语从句：
主语从句的引导词;主句的谓语动词，一般用单数。如:
1. That the earth goes around the sun is known to all.
( = It is known to all that the earth goes around the sun. )
2. Whether she will come is up to her boss.(此时不能用if)
二、宾语从句：
宾语从句的引导词和引导词的省略以及从句的语序。如:
1. He believed that walking under a ladder brings bad luck.
2. You can learn what you do not know from the class.
3. Let me know which of the books is the best.
三、同位语从句
同位语从句的特点是由一个抽象名词+that从句构成，引导词一般是that, 而且that在从句中不充当任何成分。这些抽象名词有:news, idea, fact, doubt, evidence, promise, rumor, hope, truth, belief, message等，同位语从句是对抽象名词进行说明解释。
1. The news that our football team at last defeated Korea made the fans wild with joy.
2. There is much evidence that the crime rate in this city is on the rise.
四、定语从句
定语从句主要用来修饰它前面的先行词(名词或代词)的从句，所以又称形容词从句。
1. 当先行词是all, everything, nothing, something, little, much时;当先行词被all, no, some, any, every, a few, a little, much, only, very修饰时;当先行词被序数词或形容词最高级修饰时，定语从句的引导词用that。例:
There is no person that doesn't make mistakes. 没有人不犯错误。
2. "the same ...as", "such...as"中的as可以指人或物，作从句的主语、宾语、表语或介词的宾语。如:
Such money as he earned was spent on spirits and tobacco.
3. why引导表示原因的定语从句，其先行词一般是reason。如:
He did not tell us the reason why he was late again.The reason why(that)he didn't come is that he was ill.
4. 当定语从句为there be句型时，关系代词只能用that。
This is the only that there is a read cover.
5. 当主句是以which或who开头的特殊疑问句时，关系代词只能用that。
Who is the girl that is talking to Tom.
6. 如果出现两个或两个以上的先行词，并同时兼指人和物时，关系代词用that。
We are talking about the people and countries that we have visited.
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