Two adults on cellphones downtown.
Two adults are on their phones.
Two adults on their phones is almost the same as saying two adults are on their cellphones.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_downtown(x2) & of(x2,x3) & n_cellphone(x3) & n_adult(x1) & card_eq_2(x1))
exists p1 x1 x2.(on(x1,x2) & n_phone(x2) & of(x2,x1) & n_thing(x1) & n_adult(x1) & card_eq_2(x1))