The two man are fixing something.
Two men are working on a car.
Just because two men are fixing something does not mean they are working on a car.
exists e1 x1 x2.(n_man(x1) & card_eq_2(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fix(e1) & n_thing(x2))
exists e1 x1 x2.(on(e1,x2) & n_car(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_2(x1))