basketball players on the court.
throwing basketball
just because the basketball players are on the court that doesn't mean they're throwing a basketball, they could just be standing there or throwing a different kind of ball.
exists x1 x2 x3.(n_court(x3) & a_topic(x1) & on(x1,x3) & n_player(x1) & of(x1,x2) & n_basketball(x2))
exists x1 x2.(n_basketball(x1) & of(x1,x2) & n_throwing(x2) & a_topic(x1))