写雅思大作文就如同在建筑一座大楼一般。首先是进行大楼结构设计，然后再进行实际的建筑工程，最后经过装修而成为耐用而漂亮的大楼。良好的结构对于大楼的实用以及美观有着非常重要的作用。同样道理，良好的作文结构也将提高文章的质量和成绩。从一定意义上来说，优秀的作文结构可以使内容条理清晰易懂，还可以弥补语言表达上的不足。
议论文的整体结构
一篇好的议论文一般由三个部分构成，分别是导语段（Introduction），主体段落（Body）与总结段（Conclusion）。这个结构很像三明治，其中导语段与总结段就像最上层和最下层的面包，而主体段落为论证段，相对较为重要，就像三明治中间的肉和菜。其结构如下图所示：
Introduction |
Body |
Conclusion |
通常情况下按照实际的需要，中间的主体部分（Body）又可以分成二到四个段落，其结构图分别如下：
Introduction |
Body Paragraph 1 |
Body Paragraph 2 |
Body Paragraph 3* |
Body Paragraph 4* |
Conclusion |
(注：*段落视需要而增加)
由于导语段中最重要部分是中心句（Thesis statement），它是全文的立足点，决定文章的发展方向，覆盖全文；段落主题句（Topic sentence）是每一段的重点，覆盖各自所在的段落。因此，我们可以通过思考后得出议论文的中心句（Thesis statement）以及各主体段落主题句（Topic sentence）。此外，为求达到全文的统一性(Unity)和连贯性(Coherence), 考生们应当合理地安排中心句和各段的主题句的关系，使得中心句覆盖全文，使得各段的主题句很好地支持着中心句。如果中心句没有覆盖主题句，说明正文偏题了。如果中心句超过主题句，刚说明内容有遗漏，或者说内容不够全面。中心句各段的主题句的关系情况可由下面三张图表示：
Thesis Statement | ||
| Topic Sentence 1 |
|
| Topic Sentence 2 |
|
| Topic Sentence 3* |
|
| Conclusion |
|
| Thesis Statement |
|
Topic Sentence 1 | ||
Topic Sentence 2 | ||
Topic Sentence 3* | ||
Conclusion | ||
Thesis Statement |
Topic Sentence 1 |
Topic Sentence 2 |
Topic Sentence 3* |
Conclusion |
其中，第一张图显示了正文内容超过了中心句内容；第二张图则相反；第三张图中正文内容与中心句题才是相吻合的。（*号表示在双边型结构的文章中没有主体段的第三段。）
接下来我们通过实例来了解中心句, 主题句与总结段的布置。比如:
Topic1: Is it not necessary to learn the skill of cooking due to the success of convenience food and read-made meals?
Thesis statement: But in my opinion, cooking is a very important ability we should not lose.
Topic sentence 1: First of all, the fact is that ready-made meals are not usually that good for us.
Topic sentence 2:Moreover, it is extremely important for children to learn how to cook,so that they will be fully independent when they grow up.
Topic sentence 3: Speaking personally, I have always enjoyed experimenting in the kitchen, by cooking slightly unconventional meals.
Conclusion: Inconclusion, although some use of convenience food is natural, no oneshould rely on it exclusively at the expense of home-cooked food. Notonly is this unhealthy but it is also threatening important skills withextinction.
Topic 2: Who should be responsible for our old people?
Thesis statement: In my essay I would like to note four different models.
Topic sentence 1: Firstly, the company can be responsible for their retired employees.
Topic sentence 2: A second solution is that the government has to have the responsibility for the old people’s care.
Topic sentence 3: Another way of solving this problem is to give back the responsibility to the individual.
Topic sentence 4: A last solution is to go back to the old model of the big family who cares for all their members.
Conclusion:To sum up I have to admit that I can’t find a really good solution forthis problem. All models have advantages and disadvantages. Certainlywe will have to go on thinking.
Topic3: Should students in high school study music as a compulsory school subject?
Thesis statement:While some think the study of music in high school is a waste ofvaluable school time, musical training and study is an important partof educational development.
Topic sentence 1: It is true that when it comes to the study and application of music, not everyone is suited.
Topic sentence 2: On the other hand, it is quite well-known that music can play an important part in the development of the human brain.
Conclusion:While not every student may be musically inclined, the study of musicis a valuable inclusion in any student’s course of study. In additionto being excellent for mental growth and development, students of musiclearn discipline, persistence and patience. Music should be acompulsory part of a high school student’s education.
议论文的段落结构
与议论文的整体结构布置相类似，在段落的写作中我们也用“三明治”结构来进行写作，即把段落分为主题句(Topic Sentence)，支持部分(Supporting Sentences)和结尾句部分(Concluding Sentences)。（注意：并不是每个段落都一定要有结尾句，重要地是要让这个段落自然地结束，不能给读者留下话还没有说完的感觉。）段落结构如下图如示：
PARAGRAPH
Topic Sentence |
Supporting Sentences |
Concluding Sentence |
接下来我们通过实例来了解主题句，支持句与总结句的布置。比如：
1. Topic Sentence: First of all, the fact is that ready-made meals are not usually that good for us.
Supporting Sentences: They contain high levels of salt and sugar, not to mention harmful preservatives and artificial colorants.
Concluding Sentence: Therefore, a diet that is exclusively made up of such food is bound to be unhealthy.
2. Topic sentence: Teenagers find many ways to drive their parents crazy.
Supporting Sentence 1: First,they may dye their hair purple or they may shave their heads bald. Theymay also shred their new and expensive jeans and sit hours after hoursin front of computers playing games or chatting with someone they neversee.
Supporting Sentence 2: Inaddition, they spend hours windowing-shopping and on the phone. Theyhave time to watch TV, but they do not have time to do their homework.
Supporting Sentence 3: Also, they are always too busy to clean their rooms, but they are never too busy to hang around in the streets.
Concluding Sentence: It is hard to be a teenager, but it is even harder to be parent of one.
3. Topic Sentence: In the second place, corporal punishment is by no means a desirable way of education a child.
Supporting Sentence 1: Numerous studies have shown that it does far more harm than good to children in their mental as well as physical development.
Supporting Sentence 2: For example, corporal punishment can give a child a sense of being treated unfairly, making him rebellious.
Concluding Sentence: This will be detrimental to the molding of the child’s character, and therefore should be avoided.
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