写英语道歉信时，务必表达诚挚的歉意和对造成不便的深刻抱歉。诚实地承认错误，说明事件的原因，表明不会再次发生类似情况，并提出补救措施。态度要诚恳，语气要诚实，同时表达愿意承担责任和弥补损失的决心。最后，再次表达歉意并希望能够得到原谅和理解。

[Your Name]
[Your Address]
[City, State, Zip Code]
[Email Address]
[Phone Number]
[Date]

[Recipient's Name]
[Recipient's Title]
[Company/Organization Name]
[Address]
[City, State, Zip Code]

Dear [Recipient's Name],

I am writing to you to sincerely apologize for [specific situation or action that requires an apology]. I understand that my actions have caused [specific consequences or issues], and I deeply regret any inconvenience or distress this may have caused you.

Upon reflection, I realize that [what you did wrong or what you should have done differently]. I take full responsibility for my actions and understand that they were [inconsiderate, inappropriate, etc.]. I assure you that this was not my intention, and I am committed to ensuring that such an oversight does not happen again in the future.

To make amends, I have [specific actions you are taking to rectify the situation]. I hope that this will demonstrate my commitment to resolving this matter to your satisfaction. I would also like to [offer a replacement, refund, or any other form of compensation if applicable].

I value our relationship and hope that you can find it in your heart to forgive me for this mistake. I am more than willing to discuss this matter further and take any additional steps necessary to restore your trust.

Thank you for your understanding and patience. I look forward to your response and hope to continue our [relationship, partnership, etc.] in the future.

Sincerely,

[Your Name]

模板1：过去没有完成的事情

Dear ______,

I am writing this letter to apologize to you for my failing to ______.

The reason is that ______. I am sorry that I cannot finish ______ in time, but is it possible that I make up the loss by ______? If so, I will put everything else aside to ______.

I do hope that you can understand my situation and accept my apology.

Yours sincerely,

Li Ming

模板2：将来不能做的事情

Dear ______,

Much to my regret / I am terribly sorry that I am unable to ______. It is mainly because at that time I will be full occupied by ______ which is quite out of my expectation, and that conflicts with your ______. Therefore I am forced to adjust my schedule and cannot make my presence on your ______. I sincerely hope that you will enjoy a good time. By the way, can we have dinner together sometime next week? I hope to see you soon.

I am really sorry again and I trust that you will understand.

Yours sincerely,

Li Ming