There are a lot's people whose do something. Drawer is drawing a pictures and sell it. Shef is cocking a meal. Taxi driver is draving taxi. Teachers help students with world. It was "EASY" proffesions. There are "HARD" Proffesions: IT-Programmer. Why is it very hard? You must know all sentences that you must write to do what you want to do. Hey, teacher isn't EASY proffesion. You must learn all the lessons and my be every day go to the universty/knowledge to understand something knew.