'X' High School,
Subject : Prayer for live in advance on account of sister's marriage ceremony.
I beg most respectfully to state that I am a student in class six in your school. My elder sister's marriage ceremony will be held on 18/04/2018. I have to do some works as my parents instruct. So, I woundn't be able to attend the class from 17/04/2018 to 20/04/2018. Now, I am badly in needed four days leave in advance.
Therefore, pray and hope that you would be kind enough to grant me four days leave in advance and oblige thereby.
Mahmudul Hasan Murad
Class : Six
Roll : 10