Study this example situation:
Alex is a bus driver, but now he is in bed asleep. He is not driving a bus. (He is asleep.) but He drives a bus. (He is a bus driver.) Drive(s) / work(s) / do(es) etc. is the present simple.
I/we/you/they drive/work/do etc.
He/she/it drives/works/does etc.
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We use the present simple to talk about things in general. We use it to say that something happens all the time or repeatedly, or that something is true in general:
Nurses look after patients in hospitals.
I usually go away at weekends.
The earth goes around the sun.
