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例2：
Do you agree or disagree with the following statement? Advertising is the only main cause for people's unhealthy eating habits.
看到这个题目，同学们立刻会开始想，有没有other reasons for unhealthy habits
想出三条如：1. People's tight schedules do not allow them to eat at regular hours;
2. Sometimes people are eager to lose weight or to keep fit so that they go on "endless diets";
3. Bearing heavy burden both physically and mentally, some consider eating constantly as their most effective stress reliever.
综上所述，advertising is not the only cause.
这个写法看起来非常完备，但其实犯了一个不起眼却严重的错误--题目不是要我们证明it is not the only cause，而是要我们去证明it is not the only main cause。多一个"main"，意思是很不一样的。如果我们只需要证明it is not the only cause，那么找出other causes即可即例1中的写法。
但是，如果我们要证明it is not the only main cause，就需要证明other causes that we mentioned are also main causes，这就需要在每一段中加上一些专门的说明。或者，更简单的办法是去证明advertising is not even a cause, 直接在每段的末尾加上advertising与该段所论述的unhealthy eating habit无关的论述即可。If it is not a cause, how can it be the onlymain cause? 这样一来，就不用通过证明还有其他main cause来反驳了，事实上，证明某种cause是main cause还是挺有难度的，建议同学们用后一种方式进行论述。
因此，文章还是disagree，而三段的主题句分别应该是：
1. People's tight schedules do not allow them to eat at regular hours, and it is obvious that they are too busy to be influenced by advertising;
2. Sometimes people are eager to lose weight or to keep fit so that they go on "endless diets", and this is more like a result of human nature, the pursuit of beauty, but not advertising;
3. Bearing heavy burden both physically and mentally, some consider eating constantly as their most effective stress reliever, and it is quite clear that no advertising encourages them to do so.
同学们在写文章的时候一定要注意两点：
1、每个中间段的topic sentence是用来支持main idea的;
2、topic sentence后面的每句话都是用来支持该topic sentence的。在上面的两个例子中，大家会发现例2的错误主要是main idea没有很好地被topic sentence支持;而例1的错误在于topic sentence虽然看起来是支持main idea的，但是论述的内容可能跟关键词"more"无关，从而不能有力地支持topic sentences。这些错误的起因，则是对题干中关键词的忽略。
延伸阅读：
托福独立写作评分细则与机经使用
托福独立写作观点选择的准则
托福作文写作步骤建议
更多阅读资料：
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