Dear ,
I am sorry that I must apologize for。。。。。。。 .
I’m writing to tell you the reason for it. 。。。。。。
I’m afraid what I have done has caused much inconvenience to you. In order to make up for my fault, I will…… .
Please accept my apology. I do hope you can understand me and excuse me for my carelessness .
延伸阅读：
道歉信的常用句式：
1. Much to my regret，I am unable to… 让我感到极为遗憾的是自己不能……
2. Excuse me for my not being able to… 请原谅我不能……
3. I would like to give you my apology for... 对于……，我向您道歉。
4. I must apologize to you for…就......，我必须向您道歉。
5. I'm really sorry and I hope you will be back soon. 真的很抱歉，希望你不久就回来。
6. I’m sorry to tell you that I can’t... 对未能做……，我表示遗憾。
7. Please accept my sincere apology for... 请接受我关于……的真诚道歉。
8. Please accept my sincere apologies for this unhappy experience. 对于这次不愉快的经历，请接受我诚挚的歉意。
9. We assure you that such a matter will never happen again. 我们向您保证，此类事件不会再发生。
10. I would be very much appreciated if you could……如果你能。。。我将万分感激
11. I'm afraid what I have done has caused much inconvenience to you.
12. Let’s not put a little misunderstanding between us. 别让我们之间存在哪怕一点点的误解。
13. I hope that the settlement of the matter will meet your wishes. 我希望对此事的处理能满足您的愿望。
14. I sincerely hope you can understand that I offended you unintentionally. 我真心希望您能理解，我并非有意冒犯您。
15. Please accept my apology. I do hope you will understand me and excuse me for my carelessness.
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