A man standing by a yellow sign.
a man stands by a sign waiting for a ride
Not everyone who stands by a sign is there waiting for a ride.
exists s1 x1 x2 x3.(a_topic(x1) & by(x1,x3) & n_sign(x3) & a_yellow(s1) & Theme(s1,x3) & n_standing(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & for(e1,x5) & n_ride(x5) & Actor(e1,x4) & v_wait(e1) & (x1 = x4) & by(x1,x3) & n_sign(x3) & n_stand(x1) & of(x1,x2) & n_man(x2))