I was just writing a composition when the doorbell rang.
我正要写一篇作文，突然门铃响了。
When writing a composition, one must avoid using stereotyped expressions.
作文一定要避免陈词滥调。
Thinking over the topic carefully and forming a clear conception fulfil the function of pointing the direction, fixing a position and grasping the key points in writing a composition.
审题立意在作文中起定向、定位、定重点的作用，是决定文章质量高低的关键性一步。
He is writing a composition now.
他正在写作文。
我正在写一篇作文。
She was writing a composition when I entered.
当我进去的时候，她正在写一篇作文。
After writing a composition, we must go over it.
写完作文后，我们必须把它从头到尾看一遍。
My father was writing a composition in the study room.
我的父亲是在书房写一篇作文。
We have two Chinese classes this afternoon, let's practise writing a composition.
今天下午有两节语文课，我们练习一篇作文。
I was doing my homework at my home. My father was writing a composition in the study room.
我正在家里写作业，我爸爸正在书房里写作文。
I was doing my homework at my home. My father was writing a composition in the study room.
我正在家里写作业，我爸爸正在书房里写作文。
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