Two adults on cellphones downtown.
The adults are talking on their phones.
Two adults on their cellphones does not mean that they are talking, they could easily be taking pictures, reading emails or texting.
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 e1 x1 x2.(n_phone(x2) & of(x2,x1) & n_thing(x1) & n_adult(x1) & on(e1,x2) & Actor(e1,x1) & v_talk(e1))