Five entertainers on a stage.
They are singing.
Entertainers can be on the stage doing something other than singing
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_stage(x2) & n_entertainer(x1) & card_eq_5(x1))
exists e1 x1.(n_thing(x1) & Actor(e1,x1) & v_sing(e1))