I’m writing to express my gratitude ...

[Odessa Dawn]

Hi, XXX-- and I’m writing to express my gratitude for actively and constructively contributing to the writing course titled “Academic Essay.” I really enjoyed being in your classes and I found them useful and worthwhile. I appreciate you for all the hard work you put in. As a teacher, you have a busy life; yet you are happy spending your free limited time giving a great service to learners, you are pretty kind. Once again, thank you for helping learners obtain a quality education. I’m very grateful for your interest in improving students’ English.



Would check that letter for any mistakes?

 

[emsr2d2]

Hi, XXX. [STRIKE]-- an[/STRIKE]d

I’m writing to express my gratitude for your active[STRIKE]ly[/STRIKE] and constructive[STRIKE]ly[/STRIKE] [STRIKE]contributing[/STRIKE] contribution to the writing course titled “Academic Essay.” I really enjoyed being in your classes and I found them useful and worthwhile. I appreciate [STRIKE]you for[/STRIKE] all the hard work you put in. As a teacher, you have a busy life, yet you are happy [STRIKE]spending[/STRIKE] to spend your limited free [STRIKE]limited[/STRIKE] time giving a great service to learners. You are [STRIKE]pretty[/STRIKE] very kind.

Once again, thank you for helping learners obtain a quality education. I’m very grateful for your interest in improving students’ English.



Would you check that letter for any mistakes?

See above. Note that saying something is "pretty + adjective" is not really a compliment in most cases. It's like saying "You're sort of kind" or "Do I think you're kind? Hmm, yes and no".