Workmen on a fishing boat.
The men are fishing.
Not all the workmen on a fishing boat are fishing
exists s1 x1 x2.(ne_nam_workmen(s1) & a_topic(s1) & on(s1,x1) & n_boat(x1) & of(x1,x2) & n_fishing(x2))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_fishing(x2)))