The children are playing a game of checkers.
Kids stare at their cellphones
Playing a game of checkers & staring at cellphones are two different activities.
exists e1 x1 x2 x3.(n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & of(x2,x3) & n_checkers(x3) & n_game(x2))
exists e1 x1 x2.(at(e1,x2) & n_cellphone(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_stare(e1) & n_kid(x1))