第一、定语从句
      
这应该算是写作中最常用的一种句型之一。适当地运用定语从句可以给你的文章增色不少。例如,下面的这两个句子用上定语从句马上就变成了一个漂亮的复杂句。
      
Bad books contain evil thoughts. In them, there might be much description about violence, superstition, and sex.
      
→ Bad books, in which there might be much description about violence, superstition, and sex, contain evil thoughts.

第二、状语从句
      
在写作当中运用的最多的是以下五种状语从句,即原因状语从句,让步状语从句,条件状语从句,时间状语从句和目的状语从句。
      
1. 原因状语从句:常由because, as, since和for引导
      
Eg: Nonetheless, I am still in favor of space travel, for its merits far outweigh demerits.
      
尽管如此,我还是赞成太空探险,因为它的好处远远大于坏处
      
2. 让步状语从句:常由although, though, even though/ if, as long 和as not with standing引导
      
Eg: Although this view is wildly held, this is little evidence that education can be obtained at any age and at any place.
      
尽管这一观点被广泛接受,很少有证据表明教育能够在任何地点、任何年龄进行。
      
3. 条件状语从句:常由if, on the condition that和providing that引导
      
Eg: If you want to achieve something or intend to fulfill one of your ambitions, you must work hard, make efforts and get prepared.
      
假如你要取得成就或要实现你的雄心壮志,你必须努力工作、艰苦奋斗、准备好条件。
      
4. 时间状语从句:常由when和while引导
     
Eg: When it comes to education, the majority of people believe that education is a lifetime study. 说到教育,大部分人认为其是一个终生的学习。
      
5. 目的状语从句: 常由so that和in order that引导
      
Eg: Millions of people have to spend more time and energy on studying new skills and technology so that they can keep a favorable position in job market.
      
成千上万的人们不得不花费更多的精力和时间学习新的技术和知识,使得他们在就业市场能保持优势。

第三、宾语从句
      
Eg: Some people claim that government should be mainly responsible for the environmental pollution.
      
一些人认为政府应对环境污染负主要责任。
      
Eg: Many experts point out that, along with the development of modern society, it is an inevitable result and there is  no way to avoid it. 许多专家指出这是现代社会发展必然的结果,无法避免。