Boy eating a slice of pizza
There is pepperoni on the pizza.
Not all pizza has pepperoni.
exists e1 x1 x2 x3.(ne_nam_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & of(x2,x3) & n_pizza(x3) & n_slice(x2))
exists p1 x1 x3.(n_pizza(x3) & exists x2.((x1 = x2) & on(x2,x3) & n_pepperoni(x2)))