Q: "Two boys playing basketball was the referee looks on." Does this mean that "The boys are playing without a referee."?
A: no

Q: "Some children are playing in a woodland stream." Does this mean that "Siblings are playing."?
A: it is not possible to tell

Q: "A female martial arts student demonstrates with a weapon while others watch." Does this mean that "An older martial arts student demonstrating to younger students."?
A: it is not possible to tell

Q: "A bearded man in a black t-shirt sits in front of a desk holding a computer." Does this mean that "A man waiting with his computer."?
A:
yes