Two adults on cellphones downtown.
Two people are on cellphones.
Because there are two adults on their cellphones, we can also say that there are two people 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.(exists x2.(on(x1,x2) & n_cellphone(x2)) & n_people(x1) & card_eq_2(x1))