Bin mir nicht so ganz sicher ob das richtig ist aber zumindest hast du dann einen Ansatz wie du es sagen könntest. :)

My favourite subject is english because I have a very good english teacher. I always learn something in her lessons and she trys everytime to get out of the best of us students. Thats the reason why I like this subject and have more fun in my english lessons. Therefore I want to thank her.