Q: "A black dog is swimming while carrying a tennis" Does this mean that "A dog is swimming while carrying a racket."?
A: it is not possible to tell

Q: "Three men in work-related uniforms standing next to a building." Does this mean that "Several men prepare for a day of work."?
A: it is not possible to tell

Q: "A long line of men veiled demonstrating something." Does this mean that "The frog croaked all night."?
A: no

Q: "In a city in front of a subway, a man skateboards down a stairway as two older ladies sitting on a bench watch him." Does this mean that "The man is skateboarding while it's sunny."?
A:
it is not possible to tell