A group of children prepare to perform.
Some children get ready.
prepare is  a synonym of ready.
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2.(Actor(e2,x1) & v_perform(e2)) & of(x1,x2) & n_child(x2) & n_group(x1))
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_ready(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_child(x1))