A group of people are performing a play.
the group are doing a peformance
"the group are doing a preformance" is a rephrasing of  " a group preforming a play"
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_play(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(n_group(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_peformance(x2))