A man walking by a stop sign.
A man is walking to an appointment.
A man could walk somewhere other than to an appointment.
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 e1 x1 x2.(to(e1,x2) & n_appointment(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))