Dear (The person you give the letter to)
I am sorry of my son's absence, he is apparently not feeling well because he was hospitalized due to pneumonia, I hope he can be better someday and accept this excuse letter for necessary information regarding from the doctor.
My son's absence is due to his sickness called (name) and I should probably take him to the hospital for about (how many days) thank you for your cooperation.
first write about the reasons of your being absent and write an excuses like pls accept my request and beg for your life and write the signature of your parents approval and give to your teachers
It's level (ex. Principal III)
Please excuse me for having been absent from your class yesterday because I have important matters to attend.
I am hoping for your consideration.
List of subject teachers name