Objects in the image:
category: person
category: tennis racket
category: person
category: person
category: person
category: person
category: person
category: bench
category: bottle
category: bench
category: person
category: person
category: person
category: backpack
category: bottle
category: bottle

Guessing-game dialogue about one of the objects:
q: Is it a person?
a: Yes
q: Is it the player in front?
a: No
q: Is it one of the first three by the fence on the left?
a: Yes
q: Is it the one on the court?
a: Yes