Three children are playing on a field with a ball.
Children playing video games.
Children could be equal, less or more than three.  If children are playing with a ball they are not playing video games.
exists e1 x1 x2 x3.(with(e1,x3) & n_ball(x3) & on(e1,x2) & n_field(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_3(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_game(x3) & of(x3,x4) & n_video(x4) & (x1 = x2) & n_child(x1))