A dog drinking out of a water spigot.
The dog is chasing a ball.
The dog who is drinking out of a spigot is not chasing a ball.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(e1,x3) & n_spigot(x3) & of(x3,x4) & n_water(x4) & r_out(e1) & Actor(e1,x2) & v_drink(e1) & (x1 = x2) & n_dog(x1))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_ball(x2))