Two kids are swinging on a swing while standing.
The two kids are standing.
"Swing on a swing while standing" implies they are standing.
exists e2 e1 x1 x2.(while(e1,e2) & Actor(e2,x1) & v_stand(e2) & on(e1,x2) & n_swing(x2) & Actor(e1,x1) & v_swing(e1) & n_kid(x1) & card_eq_2(x1))
exists e1 x1.(n_kid(x1) & card_eq_2(x1) & Actor(e1,x1) & v_stand(e1))