通过审题，我们知道该如何确定正确的写作思路。下边我们就谈如何些。第一部就是要写主题句。主题句是确保不跑题的前提，只有不跑题才有可得及格分。写主题句嘴保险的方法就是把中文提纲的各句译成英语。例如上述三段主题句分别为：本文来自好学英文网

It is very necessary to be a good university student . （议论体的主题句）
There are several respects of necessities to be a good university student .（说明体的主题句）
What I will do in the future is the following .(描述体主题句)

如果要求句是英语就可以把它变成主题句，例如这样一篇作文：

Good Health

Importance of good health
Ways to keep fit
My own practice
这样的作文的要求句就可以扩充成主题句。扩充后三段的主题句分别为：
It is very important to have good health .（将名词 importance变成形容词important）
There are four ways to keep fit for me .（用 there be 句型）
My own practices are the following .（采用原词）