A woman is watching a black dog.
a woman petsitting for her neighbor
A woman that is watching a dog isn't necessarily petsitting for her neighbor.
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 x1 x2 x3.(a_topic(x1) & for(e1,x3) & n_neighbor(x3) & of(x3,x1) & n_female(x1) & Actor(e1,x2) & v_petsitt(e1) & (x1 = x2) & n_woman(x1))