A woman in her underwear performing for a video.
She is filming an advertisement.
A woman in her underwear performing for a video is not necessarily filming an advertisement.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & for(e1,x4) & n_video(x4) & Actor(e1,x3) & v_perform(e1) & (x2 = x3) & n_underwear(x2) & of(x2,x1) & n_female(x1) & n_woman(x1))
exists e1 x1 x2.(n_female(x1) & Theme(e1,x2) & Actor(e1,x1) & v_film(e1) & n_advertisement(x2))