【正确答案】Dear Manager Li, I handed in my resignation this morning to the Human Resources Department, and I am going to leave the company next week. I write to you to show my appreciation for your kind help in my work. I still remember when I first came to this company I knew little about my work and made a lot of mistakes. With your timely and kind help, I grew quickly and learned many career skills. With your guidance, I can manage nearly everything independently now. I resign because I want to start up my own business, which is a dream for my whole life. I have confidence in myself, especially with the equipment of the skills I learned from you. Thanks again for your help and I hope we can often keep in touch with each other. Best wishes, John Smith