People looking at a car exhibit.
The people are swimming.
One cannot be swimming or looking at a car exhibit at the same time.
exists e1 x1 x2 x3.(at(e1,x2) & n_exhibit(x2) & of(x2,x3) & n_car(x3) & Actor(e1,x1) & v_look(e1) & n_people(x1))
exists e1 x1.(n_people(x1) & Actor(e1,x1) & v_swim(e1))