This semester I took 1553403 Essay writing with you. At the beginning, I was
"You were a great teacher. I liked your class." Instead, say something like, "You had a simple way of helping me understand a really difficult subject" or "Your influence helped me to become more confident."
Teachers need to know how their specific actions and unique personalities make a difference for their students.
Don't try to give advice or talk down to someone who has a lot more life experience than you do. Instead, say, "I would have preferred ______" and state your opinion rather than trying to sound helpful.