A choir group is gathered together in a church.
The choir group is preparing to sing together.
A choir is a group of singers, and singing often happens in a church, therefore they would be singing together as a group.
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_church(x3) & a_together(s1) & Manner(e1,s1) & Theme(e1,x1) & v_gather(e1) & n_group(x1) & of(x1,x2) & n_choir(x2))
exists e1 p1 x1 x2.(n_group(x1) & of(x1,x2) & n_choir(x2) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 p2.(exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e2,p2) & Actor(e2,x1) & v_sing(e2)))