

The book is on the table.
Used to indicate a position above something and in contact with it.
The cat is on the roof.
The keys are on the counter.
The picture is on the wall.
on the floor
on the shelf
on the desk
upon
over
above
The lights are on.
Indicates a state of being active or functioning.
The door is open.
The engine is running.
The computer is on.
lights on
music on
alert on
active
functioning
operational