People are walking down a street.
Children are walking into a school.
They are either walking down a street or actually into a school.
exists e1 x1 x2.(down(e1,x2) & n_street(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2.(into(e1,x2) & n_school(x2) & Actor(e1,x1) & v_walk(e1) & n_child(x1))