A black dog plays with a toy on the grass.
He is playing with his owner.
You can not infer he is with his owner.
exists e1 s1 x1 x2 x3.(n_grass(x3) & with(e1,x2) & on(x2,x3) & n_toy(x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_owner(x2) & of(x2,x1) & n_male(x1) & n_male(x1) & with(e1,x2) & Actor(e1,x1) & v_play(e1))