Paul goes to work at 9 every morning.
|The past and future simple can be used to talk about single events:|
but in the present we are in the middle of it, so we have to use the present progressive:
|The present simple simple is used to talk about general truths, such as scientific facts:|
|The present simple simple is also used in book and film reviews, because books and films always tell the same story:|
We also use it for jokes and anecdotes, which always tell the same story, and in dramatic narrative:
Finally, we use it in sports and concert commentaries:
even though the events are taking place at the moment of speaking (it's a lot easier to comment live using the present simple, too).