A young man walks his dog down some steps where a black-clad woman is sitting
The young man does not own a dog.
If the man doesn't own a dog, he cannot walk his dog
exists e1 p1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & down(x2,x3) & exists e2 s2 x4.(Actor(e2,x4) & v_sit(e2) & n_woman(x4) & a_black-clad(s2) & Theme(s2,x4)) & where(x3,p1) & n_step(x3) & n_dog(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists s1 x1.(n_man(x1) & a_young(s1) & Theme(s1,x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_own(e1) & n_dog(x2)))