a cat / on the table (+)
There's a cat on the table.
animals / in the picture (-)
There aren't animals in the picture.
sunglasses / in the box (?)
Are there sunglasses in the box?
pencils / in the pencil-case (+)
There are pencils in the pencil-case.
drawings / in the notebook (?)
Are there drawings in the notebook?
apples / in the bag (+)
There are apples in the bag.
people / in the house (-)
There aren't people in the house.
a pen / in the pencil-case (+)
There's a pen in the pencil case.
a laptop / on the desk (-)
There isn't a laptop on the desk.
a key / on the desk (?)
Is there a key on the desk?
a sandwich / in the bag (?)
Is there a sandwich in the bag?
a book / in the box (-)
There isn't a book in the box.