Workmen on a fishing boat.
The men are swimming in a pond.
Men cannot be on the boat and  be swimming at the same time.
exists s1 x1 x2.(ne_nam_workmen(s1) & a_topic(s1) & on(s1,x1) & n_boat(x1) & of(x1,x2) & n_fishing(x2))
exists e1 x1 x2.(n_man(x1) & in(e1,x2) & n_pond(x2) & Actor(e1,x1) & v_swim(e1))