Two young boys run on the beach with ducks behind them in the pond.
Two boys are catching fireflies.
you cannot run on the beach and be catching fireflies
exists e1 s1 x1 x2 x3 x4.(n_pond(x4) & n_thing(x2) & n_beach(x2) & in(e1,x4) & on(e1,x2) & with(x2,x3) & behind(x3,x2) & n_duck(x3) & Actor(e1,x1) & v_run(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_firefly(x2) & n_boy(x1) & card_eq_2(x1))