You had been ill for three days. Write a letter to the Headmaster/Headmistress of your school seeking a leave of absence for those days.
Bidhannagar High School,
Sub: Leave of absence
Most respectfully, I beg to state that I was unable to attend school for three days from Oct 23 to Oct 25 as I was down with a high fever due to a viral infection.
I would be highly obliged if you could kindly grant me a leave of absence for those three days. The prescription of a doctor is attached to it.
Place: khatpukur, Durgapur