Two boys fight for the ball.
Two boys playing basketball.
No indication that two boys are playing basketball. The ball could have been another type of ball.
exists x1 x2 x3.(n_ball(x3) & a_topic(x1) & for(x1,x3) & n_fight(x1) & of(x1,x2) & n_boy(x2) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_basketball(x3) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))