Two adults on cellphones downtown.
Some people are speaking on devices.
A cellphone is a speaking device and two adults in downtown could be described as "some people" who are on their speaking devices.
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.(on(e1,x2) & n_device(x2) & Actor(e1,x1) & v_speak(e1) & n_people(x1))