我帮你修改一下你的作文,写在下面,你看看,这个比较简单,希望可以帮你.
Dear Mr.Smith,
I'm Li Min.Due to rain,I have a cold and is sneezing and coughing.
Unfortunately,I have to go to hospital to have a checkection and injection.
I 'm begging you to approve one day leave for me tomorrow.For today's
homework ,I'll send it to Lisa .She will give it to you at tomorrow morning For tomorrow's homework ,I'll let Lisa tell me after school ,I'll hand over to you personally at the day after tomorrow morning.
Yours respectfully
Li Min
最后你补的一篇基本没问题,但是请注意书信的格式,我写的这个应该格式很标准,左右对齐及署名等需要注意,应用文中格式也占一定的分数,现在记好了,对于你以后的考试等会有帮助.