A man walks a black dog on a very long leash.
The man is sitting besid the dog.
If a man is walking, he is not sitting.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & on(x2,x3) & n_leash(x3) & a_long(s2) & Theme(s2,x3) & r_very(x3) & n_dog(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_dog(x2) & n_man(x1) & besid(e1,x2) & Actor(e1,x1) & v_sit(e1))