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.
Eg: Some people claim that government should be mainly responsible for the environmental pollution.
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.
强调句。It is + 被强调的内容 + that
Eg: It is cars and factories that release a great deal of gases, polluting the environment.
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.
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.
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.
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.
Eg: What has caught our attention is /It is noticeable that the environment in both the rural and urban areas is deteriorating.
Eg: It is universally acknowledged that environmental pollution becomes one of the most serious problems in China or even the world as a whole.
Eg: It is an undeniable fact that environmental pollution becomes increasingly serious.
Eg: No one can deny the basic fact that it is impossible for average workers to master those high-technology skills easily.