Objects in the image:
category: person
category: backpack
category: person
category: person
category: skateboard
category: person
category: person
category: skateboard
category: skateboard
category: bottle
category: person
category: person
category: person
category: person
category: person
category: person

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it a skateboard?
a: Yes
q: is it on the left half of the picture?
a: No
q: Is a boy sitting on it?
a: Yes