LuvBug wrote:
Use his last name. Even when professors tell us we can call them by their first name I always address them as "Professor ______" or "Dr. _______". I feel weird calling them by their first name.

same here. i can't do it. I will avoid calling them by name though, especially if I don't know how to do it. Like my friends mom, she isn't fond of me. So i can't call her mom, but i can't call her by her first name, but mrs. last name sounds weird. so i just try to avoid it.