A line of cheerleaders in blue costumes wait to perform.
Some cheerleaders in blue prepare for the half-time show.
Waiting to perform doesn't mean that it is for the half-time show.
exists e1 p1 s1 x1 x2 x3.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2.(Actor(e2,x1) & v_perform(e2)) & of(x1,x2) & in(x2,x3) & n_costume(x3) & a_blue(s1) & Theme(s1,x3) & n_cheerleader(x2) & n_line(x1))
exists e1 x1 x2 x3 x4.(n_show(x3) & of(x3,x4) & n_half-time(x4) & for(e1,x3) & Actor(e1,x1) & v_prepare(e1) & in(x1,x2) & n_blue(x2) & n_cheerleader(x1))