同学们在写主体段时容易出现的问题不外乎几种：
1. 没有鲜明的topic sentence;
2. 对主题句没有充分的展开解释;
3. 干巴巴的分析，缺少例证;
4. 虽然有例证部分，但是略显冗长;
4. 戛然而止，没有一个合理的小结。
那么以上问题该如何解决，在给同学们解答之前，我们有必要先来探讨主体段合理的结构是什么样子。直接上图--
为帮助同学更好的理解，我们且结合一道例题来看：
Do you agree or disagree with the following statement?
Schools (universities, colleges, and high schools) should teach students about specific careers and jobs instead of general subjects.
Use specific reasons and examples to support your answer.
如果立场是”Schools should teach students about specific careers and jobs”，那么此处的topic sentence则是支撑这种立场的其中一个理由，比如: 这样可以避免学习用处不大的学科。需要注意的是，topic sentence要简明扼要，突出观点。
General statement简言之是对于topic sentence的解释说明。我们得出每一个理由，都会有一个推导的过程，得出这个理由的背后的原因，则可以写在general statement的位置上，一般不超过3句话。
Example相对就没有过多要解释说明了，即举例子来论证说明，注意例子要紧扣topic sentence，避免因太发散而偏离主题，另外例子切忌冗长，增加例子的篇幅看似可以“凑字数”，殊不知考生会因为“语言表达能力”不过关而得不偿失。
最后的closing sentence也是同学们容易忽视的地方，之所以要有这部分，一是作为对例子的分析，而是对topic sentence的呼应，只有把这句也写上才算完整，也不会给人“戛然而止”的感觉。Closing sentence不需要多言，一句话即可，只需概括例子是如何佐证topic sentence。
且看以下范例：
[topic sentence] Firstly, if universities offer career education, students can avoid learning unnecessary knowledge. [general statement] Some subjects which are currently included at school will not be used anymore after students graduate, so there is no need for them to attend some classes that schools offer. [example] For example, I am not going to work in a field that is math-related. Thus, although I should know some elementary mathematics, I do not think it is of necessity that I learn calculus or trigonometry. Similarly, a future software engineer should not bother with studying history or literature. [closing sentence] By focusing on courses students will need in the near future, schools can eliminate lessons that are of little use.
以上内容即是一个完整主体段该有的样子，同学们好好学起来，相信写作的分数就可以往上蹿一两个档次。