To your class teacher. Ask for ten days’ leave of absence to help and serve your sick mother in a hospital.
The Class Teacher,
Class XI A, Model High School,
I am sorry to inform you that my mother has suddenly taken ill. The doctor has advised us to have her admitted to the hospital. She will be kept there under observation for about ten days. As there is no one to help and serve her in the hospital, I shall have to her. Hence, may I request you to be so kind as to grant me leave of absence for ten days starting from tomorrow, I assure you, Sir, that I shall study doubly hard when I return to school to make for this loss in my studies.
X. Y. Z.