A man wearing sunglasses is sitting in the passenger seat of a silver vehicle.
A man is waiting on his girlfriend.
The fact that the man is sitting in the passenger seat of a silver vehicle doesn't necessarily imply he is waiting on his girlfriend.
exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(n_seat(x4) & of(x4,x5) & n_passenger(x5) & in(e2,x4) & of(x4,x6) & n_vehicle(x6) & of(x6,x7) & n_silver(x7) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_sunglass(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(on(e1,x2) & n_girlfriend(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_wait(e1) & n_man(x1))