A group of girls are cheering.
some girls are dancing
Girls can be cheering without dancing.
exists e1 x1 x2.(Actor(e1,x1) & v_cheer(e1) & of(x1,x2) & n_girl(x2) & n_group(x1))
exists e1 x1.(Actor(e1,x1) & v_dance(e1) & n_girl(x1))