Dear Miss Wang:
亲爱的王老师：
I am writing to express my sincere gratitude for your help in my study. Without your hel, 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.
我写信是为了表达我对您在我学习上的帮助的衷心感谢。没有您的帮助，我不会在班前三。您总是在我当我跌倒的时候支持我，指出我的错误，并告诉我如何做对它们。你总是孜孜不倦地培养我的耐心，您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. In addition, I wonder if you can pay a lot of attention to your health, get more rest.
我真诚地希望你能有一个良好的健康以及保持快乐。另外，我想如果你得多注意你的健康，更多的休息。写给老师的英文感谢信
Again, I sincerely thank you for your help!
再次，我真诚地感谢你的帮助！