A young boy wearing a black shirt , brown pants and a black watch has his hand on a white folded chair which is on the top of a large stack of similar folding chairs .
It is improbable that a boy has finished folding up the chairs after a party .
It is improbable that a boy has finished folding up the chairs after a party .
It is certain that a boy has finished folding up the chairs after a party .
A boy has finished folding up the chairs after a party .