Four people stand in front of a stage with microphones.
There are people on stage.
people are either on stage or in front of a stage means they are near a stage
exists e1 x1 x2 x3 x4.(in(e1,x2) & with(x2,x4) & n_microphone(x4) & of(x2,x3) & n_stage(x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_4(x1))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_stage(x3) & n_people(x2))