Two kids are swinging on a swing while standing.
The two kids are sitting on the ground playing legos.
You cannot be swinging and on the ground at the same time
exists e1 e2 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 e2 e1 x1 x2 x3 x4.(n_ground(x2) & n_kid(x1) & card_eq_2(x1) & on(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_play(e2) & n_lego(x4) & (x2 = x3) & Actor(e1,x1) & v_sit(e1))