A man dives into a river.
The man is fishing by the river.
One can not be fishing by and dive into simultaneously.
exists e1 x1 x2.(into(e1,x2) & n_river(x2) & Actor(e1,x1) & v_dive(e1) & n_man(x1))
exists p1 x1 x3.(n_river(x3) & n_man(x1) & exists x2.((x1 = x2) & by(x2,x3) & n_fishing(x2)))