A woman is watching a black dog.
a woman is looking at a black labrador
Not all black dogs are a Labrador.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_dog(x2) & a_black(s1) & Theme(s1,x2) & n_woman(x1))
exists e1 s1 x1 x2.(at(e1,x2) & n_labrador(x2) & a_black(s1) & Theme(s1,x2) & Actor(e1,x1) & v_look(e1) & n_woman(x1))