Dear Miss Wang:
亲爱的王老师：
I am writing to express my sincere gratitude for your help in my study.
我写信是想诚挚地感谢您在我学习上的帮助。
Without your help , my study would not be the top three in my class.
没有您的帮助，我的成绩就不会排在班级前三名。
It was you who always stood by me when I was fall. You pointed my mistakes and told me how to make them right.
是你在我失败的时候一直支持我。你帮我指出错误并告诉我怎样改正它们。

You always worked tirelessly to train my patience. Your continuous encouragement is my greatest motivation.
你总是不知疲倦地训练我的耐心。你不断的鼓励是我最大的动力。
I sincerely hope that you can have a good health and stay happy.
我真心祝愿您身体健康，永远快乐。
In addition, I wonder if you can pay a lot of attention to your health, get more rest.
另外，我希望你能多注意你的健康，多多休息。
Again, I sincerely thank you for your help!
再次感谢你的帮助！
Yours, Lily
你的学生，莉莉