People pass each other on a busy city street while talking on their cellphones.
People pass each other on a street.
Sentence 2 can refer to different people.
exists x1 x5.(all x2.(n_other(x2) -> exists e1 e2 s1 x3 x4.(while(e1,e2) & on(e2,x5) & Actor(e2,x1) & v_talk(e2) & on(e1,x3) & n_street(x3) & of(x3,x4) & n_city(x4) & a_busy(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_pass(e1))) & n_cellphone(x5) & of(x5,x1) & n_thing(x1) & n_people(x1))
exists x1.(all x2.(n_other(x2) -> exists e1 x3.(on(e1,x3) & n_street(x3) & Theme(e1,x2) & Actor(e1,x1) & v_pass(e1))) & n_people(x1))