雅思大作文写作为什么立不住 立不正？
雅思大作文写作为什么立不住、立不正？其实问题非常简单，就是没有解决写作的结构问题。很多考生在写雅思大作文时并不真正理解篇章结构的重要性，没有处理好结构问题，导致中心思想不明确，论述不清晰，因而很难获得高分。
文章都是有基本结构的，既开篇/Introduction+主体/Body+结论/Conclusion，雅思大作文也是如此。开篇要说明背景并提出观点，论证部分要有分论点和论据，最后要有结论。所以在审题的时候就要考虑如何处理结构，如何谋篇布局，如何对所给题目和要求或问题做出回应response。
以下题为例：
Extreme sports such as sky diving and skiing are very dangerous and should be banned. To what extent do you agree or disagree with this view?
根据题目，开篇应以极限运动很危险且应禁止为背景或因由，根据问题提出论点，既自己的观点。论证部分则应以自己在开篇提出的观点进行论证，赞成与否都需要进行说明和论述以论证自己观点的合理性和逻辑性。结论则应基于论证对题目和问题做出回应，既观点已得到比较充分论证，问题已得到较好回答，以简明扼要的词句进行总结。
结构就是框架，就是主体，结构立不住，立不正，不仅文章整体会受到很大影响，而且会导致写作思路不明确，文章层次和脉络不清晰，写作效果就会大打折扣，也就很难获得高分。
下面展示雅思前考官Simon撰写的范文，可以清晰辨别雅思大作文的篇章结构（后续将就此进行详细分析）：
In recent years, extreme sports have become increasingly popular, and some people argue that governments should prohibit them. I completely disagree with the idea that these sports are too dangerous, and I therefore believe that they should not be banned.
In my opinion, so-called extreme sports are not as dangerous as many people think. All sports involve some element of risk, and there should always be clear regulations and safety procedures to reduce the possibility of accidents. People who take part in extreme sports are usually required to undergo appropriate training so that the dangers are minimised. For example, anyone who wants to try skydiving will need to sign up for lessons with a registered club, and beginners are not allowed to dive solo; they must be accompanied by an experienced professional. Finally, the protective equipment and technology used in sports from motor racing to mountain climbing is constantly improving safety.
While I support regulations and safety measures, I believe that it would be wrong, and almost impossible, to ban extreme sports. In the first place, we should all be free to decide how we spend our leisure time; as long as we understand the risks, I do not believe that politicians should stop us from enjoying ourselves. However, an even stronger argument against such a ban would be the difficulty of enforcing it. Many of the most risky sports, like base jumping or big wave surfing, are practised far away from the reach of any authorities. I cannot imagine the police being called to stop people from parachuting off a mountain face or surfing on an isolated beach.
In conclusion, I would argue that people should be free to enjoy extreme sports as long as they understand the risks and take the appropriate precautions.