A man wearing a black hat is smiling on a street as other men and woman walk past.
The man is greeting the people as he is walking on by.
A man singled out as smiling can be clearly referred to as 'the' man; greeting is a likely thing for a smiling person to be doing, as smiling is a common component of greeting; men and women are people; since the other people 'walk past', nothing is stopping the man from also 'walking on by'.
exists e2 e1 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(on(e2,x9) & n_street(x9) & as(e2,x4) & n_past(x6) & of(x6,x8) & n_walk(x8) & of(x6,x7) & n_woman(x7) & -(x5 = x1) & n_man(x1) & n_man(x1) & n_man(x5) & subset_of(x6,x4) & subset_of(x5,x4) & Actor(e2,x1) & v_smile(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_hat(x3) & a_black(s1) & Theme(s1,x3) & (x1 = x2))
exists e1 p1 x1 x2.(n_male(x2) & n_people(x2) & n_man(x1) & exists e2 s1 s2.(a_by(s2) & Manner(e2,s2) & a_on(s1) & Manner(e2,s1) & Actor(e2,x2) & v_walk(e2)) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_greet(e1))