句型：1) I have to ask for leave of absence.
2) Your kind permission would be greatly appreciated.
Because of an attack of a bad cold with a fever, I shall not be able to attend classes today. I have to ask for leave of absence.
Enclosed is a medical certificate issued by the school clinic.
Your kind permission will be greatly appreciated.
l Useful Expressions
1) I would appreciate it very much if you could give me one day’s leave.