A man is servicing a truck.
A man is changing the oil of a truck.
A man may service a truck without changing the oil of the truck.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_service(e1) & n_truck(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_oil(x2) & Theme(e1,x2) & Actor(e1,x1) & v_change(e1) & of(x2,x3) & n_truck(x3) & n_man(x1))