A man and woman sitting on a parked car.
A couple is sitting on their car watching a drive-in movie.
Sitting on a parked car does not mean a couple is watching a drive-in movie.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(s1) & on(e1,x4) & n_car(x4) & a_parked(s2) & Theme(s2,x4) & Actor(e1,x3) & v_sit(e1) & (s1 = x3) & n_woman(x2) & n_man(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists e1 e2 x1 x2 x3 x4.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_watch(e2) & n_movie(x3) & of(x3,x4) & n_drive-in(x4) & on(e1,x2) & n_car(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_sit(e1) & n_couple(x1))