A man and a woman looking at the camera.
The couple are taking their engagement pictures.
Not all man and a woman looking at the camera are couple and taking their engagement pictures.
exists e1 s1 x1 x2 x3 x4.(n_camera(x4) & a_topic(s1) & subset_of(x2,s1) & at(e1,x4) & Actor(e1,x3) & v_look(e1) & (x2 = x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 x1 x2 x3.(n_picture(x2) & of(x2,x3) & n_engagement(x3) & of(x2,x1) & n_thing(x1) & n_couple(x1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1))