A dog plays with a soccer ball.
The dog's favorite toy is his soccor ball.
Not all dogs favorite toys are a soccer ball.
exists e1 x1 x2 x3.(with(e1,x2) & n_ball(x2) & of(x2,x3) & n_soccer(x3) & Actor(e1,x1) & v_play(e1) & n_dog(x1))
exists p1 s1 x1 x2 x3 x4.(n_ball(x3) & of(x3,x4) & n_soccor(x4) & of(x3,x1) & n_male(x1) & n_toy(x2) & a_favorite(s1) & Theme(s1,x2) & of(x2,x1) & n_dog(x1) & (x2 = x3))