People are fishing on the beach.
People are swimming.
The people are either fishing or swimming.
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_fish(e1) & n_people(x1))
exists e1 x1.(Actor(e1,x1) & v_swim(e1) & n_people(x1))