Many people are walking in a large public space, some are talking on cellphones.
Nobody is on their cell phone.
People are either talking on cellphones or nobody is on their cell phone.
exists e1 p1 s1 s2 x1 x2.(in(e1,x2) & exists e2 x3 x4.(on(e2,x4) & n_cellphone(x4) & Actor(e2,x3) & v_talk(e2) & n_thing(x3)) & that(x2,p1) & n_space(x2) & a_public(s2) & Theme(s2,x2) & a_large(s1) & Theme(s1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1) & n_quantity(x1))
-exists p1 x1 x2 x3.(on(x1,x2) & n_phone(x2) & of(x2,x3) & n_cell(x3) & of(x2,x1) & n_thing(x1) & n_person(x1))