A designer has to make new designs of things
A housewife has to do house work
An actor has to play roles
A businessman has to rule business
An engineer has to invent new machines or improve old ones
A teacher has to teach students
A driver has to drive a car
A musician has to play musician instruments
A cook has to make food for people
A secretary has to help director or manager
A veterinarian has to help animals
A postal worker has to deliver things to people