1·The newcomers were occupied in writing letter home.
新来的人忙着给家里写信。
2·I'm in the middle of writing a difficult letter.
我正在写一封很难写的信。
—— 《牛津词典》
3·What's the point in writing in when you only print half the letter anyway?
你只打印了信件的一半就寄走了，有什么用呢？
—— 《柯林斯英汉双解大词典》
4·I'm writing this letter to beg you for your forgiveness.
我写这封信是为了请求你的原谅。
5·I'm writing this letter to ask for suggestions about avoiding exam nerves.
我写这封信是想寻求建议的，如何才能避免考试怯场呢？
6·I'm writing this letter to ask you for some tips on traveling alone.
我写这封信是想向你寻求一些单独旅行的建议。
7·I'm writing this letter to complain about the noise from the construction site near our school, which affected study very much.
我写这封信是为了投诉学校附近的建筑工地的噪音，这些噪音严重影响了我们的学习。
8·I'm writing this letter to express our gratitude to you for we have all benefited from the lecture you gave last week.
我写这封信是为了向你表达我们的感谢之情，因为我们都从您上周所做的讲座中受益良多。
9·I am writing this letter to tell you that I have been recruited by the International Olympic Committee as the trainee reporter for the 2016 Olympic Games.
我写这封信的目的是告诉您，我已经被国际奥委会聘为2016年奥运会见习记者。
10·I'm conducting a survey about the differences between Chinese students and English students in their winter holidays. Therefore, I'm writing this letter to exchange relevant information.
我正在进行一项有关中国学生和英国学生的寒假差异的调查。 因此，我写这封信与你交换相关信息。