文档介绍：what they preach. but you showed by your actions that you are an exception.
yours sincerely,
li ming
道歉信
具体写作步骤：
首段：重述自己做错的事，表示歉意。
主体段落：说明道歉的具体原因，应尽量详细描述做错事的经过。写信时应该注意在申述理由时要照顾读信人的感受，切忌强词夺理。
结尾段：再次表明承认错误的态度，请求收信人的谅解。也可以提出补救的办法。
套话:
i would like to give you my apology for??
please accept my sincere apology for??
i am indeed very sorry for what i said/did，but believe i had no intention to insult you.
let’ s not put a little misunderstanding between us.
please forgive me for a stupid choice of words.
i feel badly sorry about it and want you to know what happened.
please accept my apologies for my oversight.
please allow me to say sorry again.
i sincerely hope you can accept my apologies and understand my situation.
once again，i’ m sorry for any inconvenience caused.
sample writing
dear professor jackson：
i am indeed very sorry that i missed the examination you gave on moby-dick last wednesday. i feel badly about it and want you to know what happened.
on my way to class that day，i had a flat tire，and i had to go with the mechanic when he repaired it. it took me more than one hour to get it done. a copy of the bill is enclosed.
i sincerely hope you can accept my apologies and understand my situation. i would appreciate your allowing me to take a make up examination. i will come to your office during your office hour on monday to discuss this possibility with you. once again，i’ m sorry for any inconvenience caused.
sincerely yours，
li ming
投诉信
（1）开头：自我介绍，交代投诉内容，表明本信的目的和要求。
（2）正文：说明情况，讲清利害，分析利弊。告诉对方你因此受到的伤害或不便，提出解决问题的建议，表明希望如何处理。
（3）结尾：表达希望问题得到迅速恰当解决的强烈愿望，希望尽快得到满意的答复。
投诉信经典句型归纳
（1）it is a great pity that we find there is something wrong with?
（2）would you please let me know whether or not you can?as soon as possible?
（3）i hope that my problem will get your kind consideration.
（4）i am sure there are technical or manmade errors involved.
（5）l hope you can make an investigation into this matter as soon a