A man at a food stand is serving customers.
a man is serving hotdogs to customers
The man is serving customers but he is not necessarily serving hotdogs.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_serve(e1) & n_customer(x4) & at(x1,x2) & n_stand(x2) & of(x2,x3) & n_food(x3) & n_man(x1))
exists e1 x1 x2 x3.(to(e1,x3) & n_customer(x3) & Theme(e1,x2) & Actor(e1,x1) & v_serve(e1) & n_hotdog(x2) & n_man(x1))