Boy eating a slice of pizza
The boy is eating cake.
The boy cannot be eating pizza and cake at the same time.
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.(n_boy(x1) & exists s1 x2.((x1 = x2) & n_cake(x2) & a_eating(s1) & Theme(s1,x2)))