Answer:
Dear Principal,
I am writing to apologize for my recent absence from school. I understand that this is unacceptable and have taken steps to ensure it does not happen again in the future.
I take full responsibility for my actions and realize now how important attendance at school is. I will do whatever necessary to make up any missed work or assignments due to my absences so as not disrupt the learning of other students in class.
Once again, please accept my sincere apology for missing classes without prior notice or permission from you or anyone else on staff at our school district office . Thank you very much for your understanding during this time period; I look forward continuing with a successful academic year ahead of me here at [School Name].
Sincerely, [Your name]