Dear__________,
I am sure it will come as no surprise that I wish to resign my position as __________ . Though I have enjoyed working with you and other colleagues in the company / organization, there are a few reasons that force me to give up my current work.
For one thing, __________. For another, __________. Moreover / Besides / In addition, __________.
I appreciate the plenty of help and encouragement from you constantly, and I am very sorry for any inconvenience thus caused. I promise that I will stay through the next month to help you find a replacement for my position.
Applicant:
Date: June 22, 20xx
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