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 dont know how to thank you enough for your help.
感谢信结尾段常用句式和套话
i must thank you again for your generous help.i am most grateful for your selfless donation.
my true gratitude is beyond the words description.i feel most obliged to thank you once more.please accept my gratitude, now and always.★例：
directions:
after being involved in an accident, you were looked after by another person. write a letter:
1) mentioning what happened in the accident,
2) telling the person about your recovery, and
3) expressing your thanks.
you should write with no less than 100 words on answer sheet 2. do not sign your own name at the end of the letter. use li ming instead. you do not need to write the address.
范文：
dear john,
i am writing to thank you for looking after me after that unfortunate accident the other day, when i was knocked off my bike by a taxi. if it had not been for your assistance in giving me first aid and taking me to a nearby hospital, i fear that the consequences might have been much more serious
dear staff，
abundant thanks to each one of you for your patience, expertise and genuine concern. it was you who helped me believe in myself and gave me assurance that i could walk again. i would never forget each word you said to me and the things you have done to me. forgive me for the times i lashed out at you in frustration and thank you for understanding and remaining firm with me.
never stop your beautiful way of working with people. your help really means a lot to me and anyone who in trouble as well.
affectionately,
wang fang
译文
亲爱的全体工作人员：
我写这封信是为了表达我对你们的真诚感谢。现在我又可以一个人在家了，我真的非常高兴。我在康复中心接受你们的关照时，就已经决心只要一有时间就给你们写感谢信了。对于你们每个人的耐心、专业精神和关心我表示深深地感谢。是你们使我相信自己能够站着走路。你们说的每一句话、做过的每一件事我都不会忘记。请原谅我在受挫时对你们大发脾气，谢谢你们的理解和对我的严格要求。
继续你们美丽的事业吧。你们的帮助对于我和其他需要帮助的人来说有着非常重要的意义。
你们的朋友：
王芳