A man with a camera.
A cat is eating a bird.
A man is not a cat
exists x1 x2.(a_topic(x1) & with(x1,x2) & n_camera(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_bird(x2) & n_cat(x1))