A nun is grabbing a bite to eat.
This lady is buying a sandwich.
Not every lady is a nun, and not every bite to eat is a sandwich.
exists e1 p1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_grab(e1) & Topic(x2,p1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_eat(e2) & n_thing(x3)) & n_bite(x2) & n_nun(x1))
exists e1 x1 x2.(n_lady(x1) & Theme(e1,x2) & Actor(e1,x1) & v_buy(e1) & n_sandwich(x2))