Band members are playing a song on stage.
band members are swiming
People who are swiming can not be on a stage at the same time.
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_stage(x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_song(x3) & n_member(x1) & (x1 = x2) & ne_nam_band(x2))
exists e1 x1 x2.(Actor(e1,x1) & v_swime(e1) & n_member(x1) & of(x1,x2) & n_band(x2))