Q: "Three young boys wearing dark colored pants are running on a track." Does this mean that "Nobody is running"?
A: no

Q: "The bike is secured to a metal post." Does this mean that "She is riding the bike down the street."?
A: no

Q: "two fluffy dogs jumping to catch a tennis ball." Does this mean that "Two dogs are out at the dog park with their owner."?
A: it is not possible to tell

Q: "A flight attendant is pushing a beverage cart through the isles of an airplane." Does this mean that "The flight attendant is serving drinks to passengers."?
A:
yes