He doesn't finish work at 8 o'clock.
Does he finish work at 8 o'clock?
Does he finish work at 8 or at 9 o'clock?
When does he finish work?
He doesn't finish work at 8 o'clock.
Does he finish work at 8 o'clock?
Does he finish work at 8 or at 9 o'clock?
When does he finish work?