A group of girls are cheering.
A group of people are mourning.
One cannot be cheering and mounting simultaneously.
exists e1 x1 x2.(Actor(e1,x1) & v_cheer(e1) & of(x1,x2) & n_girl(x2) & n_group(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_mourn(e1) & of(x1,x2) & n_people(x2) & n_group(x1))