✔ 最佳答案
Dear Sir/Madam:
I am appreciated with your taking care of me for the past several months, I am sorry to inform you that I would like to resign from my position for my personal reason and the working pressure as well, please kindly approve my request.
Thank you for your kind attention.
(actually you may have to also state your effective date of your resignation, for example, the effective date of my resignation is August 30th 2008}