我给你一篇例文吧Dear teacher: I really want to say thank to you because I have changed so much just because one sentence you I used to be a naughty boy/girl and not study I thought you would punish me for my poor score， while you didn' I was so touched by what you said that day and since then I changed my attitude， all because of your confidence with me and your encouragement to me! Thank you!
would like to thank you for all the help you gave me during this past You were alway so patient when I asked you You listened to them carefully and explained everything so You showed me different ways to practice and remember new words and I felt so encouraged and became more comfortable in speaking E You made the excercise so interesting that I was always very eager to participate and My English has improved so How could I thank you enough?! I cannot wait to take your class next semester and keep working on my E Sincerely yours，
Dear teacher ， I am writing to you to express my thanks for your help in learning English and speaking E During these days in your class， I have learned much from
