A black dog splashes in the water.
The black dog is a labrador.
Not all black dogs are labradors.
exists s1 x1 x2 x3.(n_water(x3) & a_topic(x1) & in(x1,x3) & n_splash(x1) & of(x1,x2) & n_dog(x2) & a_black(s1) & Theme(s1,x1))
exists p1 s1 x1.(n_dog(x1) & a_black(s1) & Theme(s1,x1) & exists x2.((x1 = x2) & n_labrador(x2)))