雅思写作技巧：对比论证法

方法一，题目出现两个对立的事物时，可以用in contrast, by comparison, however 等进行对比，但一定要注意前后的论证不要只是加个否定词而已。
以雅思常考话题为例：在学校学习好还是通过网络学习好
In light of the technological development, there has been a speculation as to the role of teachers in future education. To what extent do you agree that teachers are been replaced by computers?
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例如：持老师讲课被比电脑授课更好的观点：老师讲课不会被电脑所取代，电脑只提供具体的知识，而老师可以使人明智，帮助学生建立自信，让学生更积极对的思考，这些对学习更重要。
The computers may communicate concrete knowledge. In contrast, the teacher is able to communicate wisdom, to build self-confidence, and to make one think creatively, which is a more important part of learning.(千万不要写In contrast, the teacher is not able to communicate concrete knowledge. 只是对之前的否定就没有意义了。)
方法二，一个事情如果不发生，会产生什么情况，可以用otherwise引导。
以关于通过旅游还是读书来认识其他国家的文化为例
It is not necessary to travel to other places to learn about other culture. We can learn as much information from books and the Internet. To what extent do you agree?
例如：如果认为可以通过书本了解别的国家。通过书本可以了解一个地区的文化，否则这些知识就很难获取因为大部分人很难抽出大量的时间去旅游。
People can have a basic idea of the richness of the cultures in the country by reading relevant books. Otherwise, it is difficult to achieve for most people cannot spare a great amount of time to travel.
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方法三，虚拟语气，说明相反的情况发生，会出现的事情。
譬如还是上面那个题目，如果认为可以通过旅游了解别的国家。旅游可以获得亲身经历更全面的了解国家的文化; 如果只是看书，有时作者的某些错误的观点会影响对这个国家的理解。
By traveling in a foreign country, people can have a thorough understanding of the country by the first-hand experience. But if they only read books, the personal opinions of authors would sometimes result in the misunderstanding of the country.