Dear Miss Yao,
I will graduate from our school.I would like to thank you for all the help you gave me during the three years. You were always so patient when I asked you questions. You listened to them carefully and explained everything so thoroughly. You showed me different ways to practice and remember new words and usage. I felt so encouraged and became more comfortable in speaking English. You made the excercise so interesting that I was always very eager to participate and practice. My English has improved so much. How could I thank you enough!I will be a hard-working student.
Sincerely yours,