Dear Miss Wang,
I'm writing this letter to appreciate your help in my English.
My English is not very good and I lose my interest in learning it. However, since you taught us, my English has been better and better. In your class, we can tell stories, sing songs, play games and do many funny things. I like your class very much and I am interested in English again now. Thanks for your help.
Best wishes.
yours
LiHua