the computer is black
The computer is on.
The laptop is off.
The computer is blue.
Two computers are sitting on the table.  
They are in an office.
Two computer screens are on the table.
The screen has a blue background
A black lap top.
The desk with a laptop and moniter.
a computer monitor on the desk
a wall painted blue
laptop on a desk
silver desk top computer
A coomputer screen.
a laptop computer
a wooden desk
a laptop computer and monitor sitting on top of a wooden desk