模板1：過去沒有完成的事情

　　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