A large duck in flight over a rocky stream.
A duck is flying over water.
a large duck is flying the water stream.
exists s1 s2 x1 x2 x3.(a_topic(x1) & in(x1,x2) & over(x2,x3) & n_stream(x3) & a_rocky(s2) & Theme(s2,x3) & n_flight(x2) & n_duck(x1) & a_large(s1) & Theme(s1,x1))
exists e1 x1 x2.(over(e1,x2) & n_water(x2) & Actor(e1,x1) & v_fly(e1) & n_duck(x1))