[Your letterhead, if desired; if not, your return address]
[Date of letter—month, day, and year]
[Recipient's first and last names]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
I am writing to the teachers and staff of Lake High School to express my sincere apology for my behavior at school on Friday afternoon. I know this behavior and language were offensive to all of you and to students and school visitors. I very much regret acting this way and respectfully ask you to accept my apology. I also want to let you know that in the future, I will not behave in this way in or around the school.
If you would like to talk with me about this more, please let me know. I want to see if there is anything I can do to make up for the offensive behavior, whether it is volunteering at school activities or anything else. Thank you for your time and understanding.
[Sender's first and last names]