複合句的種類
英語的複合句一般分爲三大類型：名詞性從句、形容詞性從句和副詞性從句。
名詞性從句
在整個複合句中起名詞作用，充當主語、賓語、表語和同位語等的各種從句，統稱爲名詞性從句。名詞性從句主要有以下幾種：
1. that引導的從句e.g. It is reported that one third of Guangzhou citizens plan to buy a private car.
2. whether/if引導的從句e.g. Whether motorcycles should be banned in Guangzhou has become an issue of controversy。
3. how/why/when/where引導的從句e.g. This essay aims to explore why so many white collar workers suffer from insomnia.
4. who/whom/whose/what/which引導的從句e.g. Who should be responsible for the environmental degradation is still unknown。
形容詞性從句
具有形容詞功能，在複合句中做定語的從句被稱之爲形容詞性從句或定語從句。被修飾的名詞、詞組或代詞被稱爲先行詞。形容詞性從句分爲兩種類型：
由關係代詞who, whom, whose, that, which, as引導的從句。例如： People who are strongly against human cloning claim that it is immoral and unethical.
由關係副詞when, where, why引導的從句。例如： I would like to analyze the reasons why a growing number of teenagers are addicted to gambling。