X
It isn't a game console.
X
They aren't backpacks.
?
Is it a mountain bike?
X
They aren't skateboards.
?
Is it a game console?
+
It is a game console.
+
It is a backpack.
?
Is it a backpack?
?
Is it a laptop computer?
X
It isn't a laptop computer.
?
Are they laptop computers?
?
Are they mobile phones?
X
It isn't a mobile phone.
X
It isn't a mountain bike.