She drives a bus.
She is a bus driver.
She fights the fire.
She is a firefighter.
He drives.
He is a taxi driver.
They cook.
They are cooks.
She sings.
She is a singer.
He writes.
He is a writer.
They clean.
They are cleaners.
He waits tables.
He is a waiter.
He paints.
He is an artist / painter.
He helps people.
He is a doctor.
She dances.
She is a dancer.