Present Simple - use

Which time expression is used for Present Simple?
(Koja se vremenska oznaka koristi za Present Simple?)

He plays basketball.

Which situation cannot be expressed by the Present Simple?
(Koja situacija ne može biti izražena vremenom Present Simple?)

The Sun sets in the west.

Which situation is expressed by the Simple Present?
(Kakva situacija je izražena Present Simple vremenom?)

The school starts at 8 o'clock.

What does this sentence mean?
(Što ova rečenica znači?)