Girl poses on the edge of a porch.
A young girl poses for pictures before the prom.
Just because the girl is posing does not necessarily mean that she is posing for pictures before the prom.
exists e1 x1 x2 x3.(n_edge(x2) & ne_nam_girl(x1) & on(e1,x2) & of(x2,x3) & n_porch(x3) & Actor(e1,x1) & v_pose(e1))
exists s1 x1 x2 x3 x4.(n_prom(x4) & a_topic(x1) & for(x1,x3) & before(x3,x4) & n_picture(x3) & n_pose(x1) & of(x1,x2) & n_girl(x2) & a_young(s1) & Theme(s1,x1))