A choir is standing up on a podium singing a song.
A choir are singing.
A choir are singing and standing up on a podium
exists e2 e1 s1 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_sing(e2) & n_song(x3) & on(e1,x2) & n_podium(x2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & n_choir(x1))
exists e1 x1.(Actor(e1,x1) & v_sing(e1) & n_choir(x1))