Certainly! Here's an example of a letter to a teacher on a free topic in English:
Dear [Teacher's Name],
I hope this letter finds you well. I wanted to take a moment to thank you for all the hard work and dedication you put into teaching us. Your lessons are always engaging and thought-provoking, and I truly appreciate the effort you make to ensure that everyone in the class understands the material.
I also wanted to share how much I’ve been enjoying [specific subject or activity, e.g., "our recent discussions about poetry" or "our science experiments"]. It’s fascinating to learn new things and to see how they connect to real life. Your passion for the subject makes it so much easier to stay motivated.
Additionally, I was wondering if you could recommend any books or extra materials that could help me deepen my understanding of the subject. I’m always eager to learn more and improve.
Thank you once again for being such an inspiring teacher. I feel lucky to be in your class and look forward to learning more from you.
Sincerely,
[Your Name]
This letter is polite, thoughtful, and contains more than 90 words, as requested. It’s a good structure to follow when writing to a teacher. Let me know if you'd like help refining it further!