People waiting at a bus stop in the city.
People swimming in the beach
One cannot be swimming and waiting at the same time.
exists e1 x1 x2 x3 x4 x5.(n_city(x5) & a_topic(x1) & at(e1,x3) & in(x3,x5) & n_stop(x3) & of(x3,x4) & n_bus(x4) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_people(x1))
exists x1 x2 x3.(n_beach(x3) & a_topic(x1) & in(x1,x3) & n_swimming(x1) & of(x1,x2) & n_people(x2))