NOV.16th,2012
Subject:Casual Leave of Absence
Dear Sir,
I'm sorry to tell you that I can't go to school today,I've caught a cold because I went back home in the rain without umbrella yesterday ,so that this morning I had a headache.After taking my temperature,my mother found that I had a high fever,immediately she took me to see a doctor,who advised me to stay in bed for one days.Now I am writing to you to ask for one day's sick leave.
With best wishes
Your students,
Tom