.content {font-size:16px !important;font-family:Tahoma,"Simsun" ;line-height:28px !important;color:#333;}.content p {font-size:16px !important;padding:0 15px !important;margin:20px 0 !important;text-align:left;} 托福写作中，想要让阅卷人对内容有明确的认识，首先就要对作文做好分段。在应试型议论文写作中，通常遵循引言段——主体段——结论段的“三步曲”。主题段落提供了论证观点的理由，是整个文章的主体，占分最大。一篇满分作文必须论据充分。
1.Write a topic sentence for each paragraph you plan to write. Each topic sentence should relate to your thesis statement and introduce what the paragraph will be about. If you find that the topics you want to discuss do not support the thesis statement you have written， revise your thesis statement or reconsider your topic sentences.
（每个主体段都必须有一个明确的主题句）
2.Write ideas that support your topic sentences. The topic sentence for each paragraph tells the reader what the paragraph will be about. The ideas stated in the rest of the paragraph should all relate to the topic sentence.
（支持句必须围绕主题句展开）
新托福满分作文（5分）也要求“is well organized and well developed， using clearly appropriate explanations， exemplifications， and/or details”，同样必须通过主体段落发展来实现。一般来说，一篇议论文必须包含至少两个主体段。每个主体段都必须有明确的主题句“topic sentence”和若干支持句“supporting sentences”。他们共同组成文章的理由段，对全文的论点提供理由支持。
在初入托福写作的时候，建议大家必须遵循理由段发展的几个简单原则，这对迅速完成理由段、构建连贯和理由充分的议论文大有帮助。