在日常的英语学习中，写一封得体、真诚的道歉信是高中生必须掌握的一项基本写作技能。无论是因为不小心损坏了他人的物品，还是因为迟到或误解而伤害了朋友的感情，学会用英语表达歉意都是非常重要的。

A Letter of Apology

Dear Mr. Li,

I am writing this letter to sincerely apologize for what happened yesterday. I know that my behavior was not acceptable, and I deeply regret the trouble it caused you.

It all started when I forgot to return your textbook on time. I had borrowed it last week for a project, but I lost track of the deadline. When I finally remembered, I tried to return it as soon as possible, but by then it was already too late. I understand that this may have affected your class schedule and caused inconvenience to you. For this, I am truly sorry.

I realize that I should have been more responsible and careful with the things I borrow. From now on, I will make sure to keep track of all my borrowed items and return them on time. I also hope that you can forgive me for my mistake and give me another chance to prove that I can be more attentive in the future.

Thank you for taking the time to read this letter. I really appreciate your understanding and support.

Sincerely,

Zhang Wei

这篇道歉信包含了以下几个关键部分：

1. 开头表明目的：直接说明写信是为了道歉。

2. 说明原因：详细描述发生的事情，避免模糊不清。

3. 表达歉意：明确表示自己的错误和后悔之情。

4. 提出改正措施：展示自己愿意改进的态度。

5. 结尾感谢：礼貌地表达对对方理解的感激。

如果你需要根据具体情况进行修改，比如因考试作弊、忘记值日、或者与同学发生争执等，也可以在此基础上进行调整，使内容更加贴合实际情境。

希望这篇模板能帮助你在英语写作中更加自信、得体地表达自己的情感。