Man standing by 9-11 poster
A man is mourning at the 9-11 poster.
Just because he's standing by a 9-11 poster doesn't mean he's mourning.
exists x1 x2 x3.(a_topic(x1) & by(x1,x3) & n_poster(x3) & ne_sco_9-11(x3) & n_standing(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(n_poster(x2) & ne_sco_9-11(x2) & at(e1,x2) & Actor(e1,x1) & v_mourn(e1) & n_man(x1))