A boy and a girl are standing on a riverbank facing the water.
The boy and girl are sitting by the water.
The boy and girl cannot be standing and sitting simultaneously.
exists e2 e1 x1 x2 x3 x4 x5.(n_water(x5) & for(e1,e2) & Theme(e2,x5) & Actor(e2,x1) & v_face(e2) & on(e1,x4) & n_riverbank(x4) & Actor(e1,x1) & v_stand(e1) & subset_of(x3,x1) & n_girl(x3) & subset_of(x2,x1) & n_boy(x2))
exists e1 x1 x2 x3 x4.(n_water(x4) & n_girl(x3) & n_boy(x2) & subset_of(x3,x1) & subset_of(x2,x1) & by(e1,x4) & Actor(e1,x1) & v_sit(e1))