Three boys are playing soccer.
Boys chase a ball through a field.
Boys playing soccer do not have to be playing on a field.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_soccer(x2) & n_boy(x1) & card_eq_3(x1))
exists e1 x1 x2 x3.(through(e1,x3) & n_field(x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_ball(x2) & n_boy(x1))