【1】
i am so sorry for my late,i know you must wait for me long long time .
and i really really want it not happen,i think that must hurt you as also as me ,so i must say sorry my best friendeven if you donot forgive me.
i really not want to lose you ,you are so important to me ,i love our friendship ,so please understandme ang i promise not another time to happen this thing .
sincerely your friend
【2】
Hi Miss Liu
I am writing to express my sorry for the breaking of an appointment.
We were agreed that I will go to your office to discuss my homework on ten o'clock Monday morning, but I was busy with something else which is important for me.
I am so sorry for did not inform you about it.
Best regards XXX
【3】
I am really sorry to tell you that I was unable to attend your birthday party yesterday evening.
That is owing to the fact that my old friends visited my house without telling me the exact time.
I had to entertain those friends with my passion in the entire evening,and I will continue to entertain them in the following two days.
I really regret that I haven't go to celebrate your birthday personally and had missed a wonderful chance to enjoy myself with our kind colleages.
I have prepared a pretty gift to you yesterday and will send to you this afternoon to show my best birthday wishes.
Besides, I trust that you will understand me.
Best wishes,