A man is sitting on a silver scooter.
Some guy is parking his scooter.
We have no idea if he is parking his scooter or not, he could be doing anything on it. We have idea if it is his scooter or not, it could be anyone's.
exists e1 x1 x2 x3.(on(e1,x2) & n_scooter(x2) & of(x2,x3) & n_silver(x3) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_park(e1) & n_scooter(x2) & of(x2,x1) & n_male(x1) & n_guy(x1))