Dear Mr. Lai,尊敬的赖老师：
I am writing this letter just want to say thanks to you. I am going to graduate in two weeks. You have been my class adviser for three years. During these three years you have spent lots of energy on us. You are not only teaching knowledge in the class, but also care our life. Sometimes we are afraid of you, because of your strict requirement for our study. However, you are so helpful in the daily life. No matter what difficulties we are in, you will help if you can. So, I also want to say sorry to you for making so much trouble. But you bear all my trouble. I don’t know what kind of class adviser I will meet in the future study, but I will remember and appreciate you forever. I want to say thank you again.