A man fishing in the ocean.
Fishing happens in the ocean
A man can't fish in the ocean if fishing doesn't happen in the ocean.
exists x1 x2 x3.(n_ocean(x3) & a_topic(x1) & in(x1,x3) & n_fishing(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(n_ocean(x2) & ne_nam_fishing(x1) & in(e1,x2) & Actor(e1,x1) & v_happen(e1))