A woman smiling at a man on the street.
A woman smiles at her boyfriend.
Just because it is a man on a street does not indicate that he is her boyfriend.
exists e1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & at(e1,x3) & on(x3,x4) & n_man(x3) & Actor(e1,x2) & v_smile(e1) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2.(at(e1,x2) & n_boyfriend(x2) & of(x2,x1) & n_female(x1) & Actor(e1,x1) & v_smile(e1) & n_woman(x1))