A dog wearing a collar yawning.
A dog has no collar.
A dog that has no collar cannot be wearing a collar.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_yawning(x3) & of(x3,x4) & n_collar(x4) & (x1 = x2) & n_dog(x1))
exists x1.(-exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_collar(x2)) & n_dog(x1))