A man standing by a yellow sign.
The man waits for his friend by the yellow sign.
The man may not be waiting for a friend.
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 s1 x1 x2 x3.(n_sign(x3) & a_yellow(s1) & Theme(s1,x3) & n_friend(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & for(e1,x2) & by(x2,x3) & Actor(e1,x1) & v_wait(e1))