A woman riding on a children's toy.
Child riding on a dog.
riding a toy is not riding a dog
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_toy(x4) & of(x4,x3) & n_child(x3) & Actor(e1,x2) & v_ride(e1) & (x1 = x2) & n_woman(x1))
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_dog(x3) & n_riding(x1) & of(x1,x2) & n_child(x2))