A man standing in front of a glass door.
The man is skiiing.
A man skiing can't be standing in front of a glass door.
exists x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x3) & of(x3,x4) & n_door(x4) & of(x4,x5) & n_glass(x5) & n_front(x3) & n_standing(x1) & of(x1,x2) & n_man(x2))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_skii(e1))