A bunch of people playing soccer.
a bunch of people are playing soccer
People playing soccer is a rephrasing of people are playing soccer.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_soccer(x4) & (x1 = x3) & of(x1,x2) & n_people(x2) & n_bunch(x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_soccer(x3) & of(x1,x2) & n_people(x2) & n_bunch(x1))