在之前两个系列的介绍中，我们了解到ETS公布的独立写作185题库和改革后网考中出现的独立写作题，它们有一定的共性。从应考方面而言，在接触一个新托福独立写作的题目时，我们必须要掌握的是文章的结构。严谨的结构对观点的表达有事半功倍的作用。在ETS公布的185题库的题目和近几年的托福网考考题，除了话题上的共性外，在问题模式上和雅思议论文一样，可以归为固定的几类问题模式：
描述解释型
二选一型
比较对比型
III 比较对比型
1）。 概念判断
判断一道作文题是否属于“比较对比型”，可以看题目中是否包含下列词汇：compare and contrast，compare，advantages and disadvantages等。例如：
1. （第4题）
It has been said， “Not everything that is learned is contained in books.” Compare and contrast knowledge gained from experience with knowledge gained from books. In your opinion， which source is more important？ Why？
2. （5题）
A company has announced that it wishes to build a large factory near your community. Discuss the advantages and disadvantages of this new influence on your community. Do you support or oppose the factory？ Explain your position.
3. （113题）
The government has announced that it plans to build a new university. Some people think that your community would be a good place to locate the university. Compare the advantages and disadvantages of establishing a new university in your community. Use specific detains in your discussion.
由上述三道题中的compare and contrast，advantages and disadvantages可以判断它们都属于“比较对比型”的题目。由此可见，比较对比型和之前介绍过的二选一型有个区别，它要求考生必须两个观点或方面（即优缺点）都要提到，它显然是不能用单边论证结构。它可以采用的结构如下。
2）。 对应结构分析
双边论证
根据前一系列的介绍，双边论证基本为四段论，它与单边的最大区别在正文，正文两段分别对题干提出的两个观点或优缺点进行论证。此系列通过上面的例题二来理解这一结构的使用：
原创范例（5题）
Introduction： The new factory does bring a range of benefits， yet the residents are not advised to establish it.
Main body 1：
Topic sentence： Admittedly， the residents and the local government as well gain benefits from the construction of this factory in the community.
Reason 1： For one thing， a new factory requires plenty of new workers， providing employment opportunities for the community.
Reason 2： For another， the new factory is certain to pay tax to the indigenous government， and thus enhance the tax income of the whole community.
Main body 2：
Topic sentence： However， building a large factory could bring along a great many disadvantages.
Reason 1： First and foremost， a large factory will definitely produce pollution to the community.
Reason 2： In the second place， it is possible that traffic jams could happen due to the returning tide during rush hours.
Reason 3： Last but not least， flowing population resulted from the establishment of the factory will undoubtedly increase， which casts threat to the community.
