People walk across a crosswalk.
people are walking across the street
You can not infer they are going across the street.
exists e1 x1 x2.(across(e1,x2) & n_crosswalk(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2.(n_street(x2) & across(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))