The man is standing on the street surounded by buildings.
A young boy is sitting in the middle of the street
A boy and a man are not the same.
exists e1 e2 x1 x2 x3 x4.(n_street(x2) & n_man(x1) & on(e1,x2) & Actor(e2,x4) & n_building(x4) & Theme(e2,x3) & v_suround(e2) & (x2 = x3) & Actor(e1,x1) & v_stand(e1))
exists e1 s1 x1 x2 x3.(n_street(x3) & n_middle(x2) & in(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))