道歉信模板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
道歉信模板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 some time next week? I hope to see you soon.
I am really sorry again and I trust that you will understand.
Yours sincerely,
Li Ming
