Dear Principal {Name},
I would like to apologize for my frequent and unexcused absences this term. I understand that it is a waste of my time and my teachers' time when I only show up for some of my classes. Such behavior is rude to the school and you as well.
My absences were due to {reason}. I'm sorry that I didn't explain these circumstances to you before they arose. Next time I will make sure that I am cleared in the system before I take an absence.
I know that it is your responsibility to look after students and make sure that they attend classes. I'm sorry if I caused you any worry or inconvenience.
Sincerely,
{Your Name}
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