People admire classic cars.
People are looking at some old cars.
Classic cars are not always old cars.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_admire(e1) & n_car(x2) & a_classic(s1) & Theme(s1,x2) & n_people(x1))
exists e1 s1 x1 x2.(at(e1,x2) & n_car(x2) & a_old(s1) & Theme(s1,x2) & Actor(e1,x1) & v_look(e1) & n_people(x1))