Two kids play hockey on a pond.
There are kids playing hockey on the pond.
On a pond and on the pond mean the same thing.
exists e1 x1 x2 x3.(on(e1,x3) & n_pond(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_hockey(x2) & n_kid(x1) & card_eq_2(x1))
exists p1 x1 x5.(n_pond(x5) & exists e1 x2 x3 x4.((x1 = x2) & on(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_hockey(x4) & (x2 = x3) & n_kid(x2)))