A group of people are standing at the front of the room, preparing to sing.
The people are at church.
The room could be in any sort of building, not just a church.
exists e2 e1 p1 x1 x2 x3 x4.(n_room(x4) & n_front(x3) & for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_prepare(e2) & exists e3.(Actor(e3,x1) & v_sing(e3)) & at(e1,x3) & of(x3,x4) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1.(n_people(x1) & exists x2.(at(x1,x2) & n_church(x2)))