Hi Miss Liu(男的用Mr)
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.
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 .
"sorry,l am late,teacther!"
"oh,×××,please do not be late agin!!"