Dear [Name],

I am writing this letter to express my sincere gratitude for your help and support during my time in your class. As a student of your English course, I have learned so much and have grown to love the English language even more.
I want to thank you for your dedication and passion towards teaching English. Your style of teaching and the way you explain concepts has made it easier for the entire class to understand the language. Your ability to create a friendly and comfortable classroom environment has helped me feel more confident in expressing myself in English.
Moreover, I want to express my gratitude for the encouragement and guidance you have provided throughout my time at university. Your feedback has been invaluable in improving my writing skills and have helped me achieve a better understanding of the English language. I truly appreciate your time and efforts in helping me achieve success.
Finally, I would like to let you know that your attitude and approach towards teaching has made a huge impact on my life. Your lessons have broadened my horizons and challenged me to think differently. Your positive energy and enthusiasm have inspired me to become a better student and a better person.
In conclusion, I believe that a great teacher deserves to be recognized and appreciated. With all sincerity, I thank you for your support and for sharing your knowledge and passion for the English language with me. I will always remember the lessons and the memories we made in your class.
Yours sincerely,
[Your name]