A group of people are performing a play.
the group showed off their art projects
A group who showed off their art projects would not be performing a play at the same time.
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 s1 x1 x2 x3.(n_project(x2) & of(x2,x3) & n_art(x3) & of(x2,x1) & n_thing(x1) & n_group(x1) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_show(e1))