A seagull lands on the water.
A bird catching a fish.
A seagull does not imply catching a fish.
exists s1 x1 x2.(n_water(x2) & a_topic(x1) & on(x1,x2) & n_land(x1) & a_seagull(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_catch(e1) & n_fish(x3) & (x1 = x2) & n_bird(x1))