Objects in the image:
category: person
category: umbrella
category: tennis racket
category: person
category: person
category: person
category: person
category: tennis racket
category: person
category: person
category: person
category: umbrella
category: person
category: person
category: tennis racket
category: person
category: person
category: sports ball

Guessing-game dialogue about one of the objects:
q: is it a person?
a: Yes
q: are they on our side of the net?
a: No
q: are they participating In this game?
a: No
q: is it the female sitting and watching?
a: No
q: is it one person near the tents?
a: No
q: is it a man wearing white?
a: No
q: is it  a female  that looks like she is running?
a: No
q: is it a man in green trunks?
a: No
q: is it the man to the right of the jogging girl?
a: Yes