People are socializing outside a bookstore.
People stand by a bookstore.
outside a bookstore and by a bookstore have similar meaning.
exists e1 x1 x2.(outside(e1,x2) & n_bookstore(x2) & Actor(e1,x1) & v_socialize(e1) & n_people(x1))
exists e1 x1 x2.(by(e1,x2) & n_bookstore(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))