A group of people participating in an exercise class.
The group of people are exercising.
participating in an exercise class involves exercise.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & in(e1,x4) & n_class(x4) & of(x4,x5) & n_exercise(x5) & Actor(e1,x3) & v_participate(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(n_group(x1) & Actor(e1,x1) & v_exercise(e1) & of(x1,x2) & n_people(x2))