我们必须给他写信。
In order to write well, we must be able to read well.
为了写得更好，我们必须能够更好地理解。
We must decide on a topic before we start to write.
我们必须确定一个题目才可以着手写。
We must master both grammar and usage to write good English.
我们必须精通文法兴惯用法以便写出好的英文。
We must use our efforts to write a brilliant chapter in life!
我们要用我们的努力来谱写人生灿烂篇章！
Secondly, we must strictly follow the guidelines to write applications for the project.
其次，要严格遵循项目指南来撰写申请书。
Secondly, we must strictly follow the guidelines to write applications for the project.
其次，要严格遵循项目指南来撰写申请书。
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