What professions do you know?

profession is actually a paid occupation, especially one that involves prolonged training and a formal qualification.

for example;
teachers
professors 
actors
writers
engineers and etc. 

As for me, I know the following professions: a doctor, a laywer, a teacher, a street cleaner, a manager, a waiter, a pilot, a cook, a  stewardess, a secretary, an animator, a tutor, a housemaid, an interpreter, a bartender, a milling-machine operator, a cameraman, a surgeon, a neurosurgeon, a nurse, a judge.