One boy is pushing another boy on a swing.
One human pushing another.
A boy is a human.
exists e1 x1 x2 x3.(on(e1,x3) & n_swing(x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_boy(x2) & -(x2 = x1) & n_boy(x1) & n_boy(x1) & card_eq_1(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_thing(x2) & n_human(x1) & card_eq_1(x1))