英文道歉信

Dear XX,

Good day to you! We checked with EMS, they told us generally need taking three months to post documents to your adress. So we are apologized to you for contract being late to your company, but we will push EMS to send it to you as soon as possible, and update informations to you once available. Pls don't hesitate to contact with us if you have any doubt, tks.
Best regards.

一、道歉信：
道歉信中开头段常用句式和套话
　　e799bee5baa6e79fa5e98193e78988e69d83361I am writing this letter to express my regret…
　　I am writing to apologise for …
　　I would like to give you my apology for…
　　I am very sorry to say that …
　　I must apologize about (not) doing sth…
　　Please accept my sincerely apology for…
　　I am writing to say sorry for…
　　I am terribly sorry, but…
　　道歉信中结尾段常用句式和套句
　　Once again, I am sorry for any inconvenience caused.
　　Please allow me to say sorry again.
　　Hope you can accept my apologies and understand my situation.
　　I sincerely hope that you will be able to think in my position and accept my apologies.
　　I want to let you know how regretful I am feeling now.
　　I am sorry that I can’t… and trust that you will be able to understand.
二、感谢信：
　　感谢信开头段常用句式和套话
　　I am writing to extend my sincere gratitude for …
　　I am writing to express my thanks for …
　　I am writing to show my sincere appreciation for …
　　I would like to convey in this letter my heartfelt thanks to you for…
　　I feel deeply indebted to you and I really don’t know how to thank you enough for your help.
　　感谢信结尾常用句式和套话
　　I must thank you again for your generous help.
　　I am most grateful for your selfless donation.
　　My true gratitude is beyond my words.
　　I feel most obliged to thank you once more.

dear teacher Yu,
I am so sorry that i lost your U dick last week because of my carelessness. i know there might be some important stuff in it, but you didn't blame me and i feel so guilty about it. i have searched every cornor in my house, but still can not find it. i am almost crazy for it. As your class representative, i know i am incompetent and careless for losing your U disk. Anyway, i try my best and still cannot find it. To make up my mistake, i bought a new one for you. i know there might have very important infomation in your last one, but please accept the new one as my apology.
anyway, I feel very sorry about it. a student who made a big mistake....