A man hammers on a motorcycle wheel.
the dog eats birds
A dog cannot be a man and vice versa, and one sentence refers to hammering a motorcycle wheel and the other refers to eating a bird.
exists x1 x2 x3 x4.(a_topic(x1) & on(x1,x3) & n_wheel(x3) & of(x3,x4) & n_motorcycle(x4) & n_hammer(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_bird(x2))