An old man cleaning trash on the street.
A man collecting trash for the city.
old man cleaning trash on the street does not imply he is collecting it for the city.
exists e1 s1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_clean(e1) & on(x3,x4) & n_trash(x3) & (x1 = x2) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(n_city(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_collect(e1) & for(x3,x4) & n_trash(x3) & (x1 = x2) & n_man(x1))