dear miss wang:
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 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!