A lovely couple is dancing behind a stage.
A man and a woman are dancing to rock music.
Not every couple is a man and a woman and dancing does not imply it being to rock music.
exists e1 s1 x1 x2.(behind(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_dance(e1) & n_couple(x1) & a_lovely(s1) & Theme(s1,x1))
exists e1 p1 x1 x2 x3.(Topic(e1,p1) & Actor(e1,x1) & v_dance(e1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x1) & v_rock(e2) & n_music(x4)) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))