A man is servicing a truck.
the truck is his
The truck may not be his.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_service(e1) & n_truck(x2) & n_man(x1))
exists p1 x1.(n_truck(x1) & exists x2.((x1 = x2) & n_his(x2)))