Dear teacher：
I am writing to express my sincere gratitude for your help in my study. Without your help , my study would not be the top three in my class. It was you who always standed by me when I am fall. You pointed my mistakes and told me how to make them right. You always worked tirelessly to train my patience.Your continuous encouragement is my greatest motivation.
I sincerely hope that you can have a good health and stay happy. In addition, I wonder if you can pay a lot of attention to your health, get more rest.
Again, I sincerely thank you for your help!