People stand on a sidewalk outside of retail stores.
People were standing outside of a retail store
'People stand' and 'People were standing' are identical in reference to the same instant; outside of more than one retail store is still outside of a retail store.
exists e1 s1 x1 x2 x3 x4.(on(e1,x2) & of(x3,x4) & n_store(x4) & a_retail(s1) & Theme(s1,x4) & outside(x2,x3) & n_thing(x3) & n_sidewalk(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists e1 s1 x1 x2.(of(e1,x2) & n_store(x2) & a_retail(s1) & Theme(s1,x2) & r_outside(e1) & Actor(e1,x1) & v_stand(e1) & n_people(x1))