How to write an apology letter sincerely?

Writing ideas and points: sincerely apologize and explain what you did wrong.

Text:

Dear Class One students:

Hello! First of all, please allow me to express my sincere apologies for the registration of the Universiade!

Due to negligence in my work, I did something disrespectful to you in the process of this school sports meeting, which had a bad influence on you. This is my dereliction of duty.

In this incident, as a sports commission, I didn't do my job well and didn't do things seriously enough, so I made low-level mistakes such as poor notice. Therefore, I apologize to everyone here! Hope to forgive me! And I will seriously review my behavior and learn from it. In the future, I will set an example and do a good job in the future, and I won't make similar mistakes again.

Hereby!