A man walking by a stop sign.
A man walking by a stop sign across an empty street
Not all streets are empty when a man is walking.
exists x1 x2 x3 x4.(a_topic(x1) & by(x1,x3) & n_sign(x3) & of(x3,x4) & n_stop(x4) & n_walking(x1) & of(x1,x2) & n_man(x2))
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & across(x1,x5) & n_street(x5) & a_empty(s1) & Theme(s1,x5) & by(x1,x3) & n_sign(x3) & of(x3,x4) & n_stop(x4) & n_walking(x1) & of(x1,x2) & n_man(x2))