A man in a hat is sitting on a wall reading.
A man sitting
Man is sitting implies man sitting.
exists e1 x1 x2 x3 x4.(on(e1,x3) & n_reading(x3) & of(x3,x4) & n_wall(x4) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_hat(x2) & n_man(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))