A group of people dancing in a circle on a grass field.
Young men and women are dancing in a field.
Not all groups of people are made up of young people.  Not all groups of people are made up of both men and women.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & on(e1,x5) & n_field(x5) & of(x5,x6) & n_grass(x6) & in(e1,x4) & n_circle(x4) & Actor(e1,x3) & v_dance(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 s1 x1 x2 x3 x4.(in(e1,x4) & n_field(x4) & Actor(e1,x1) & v_dance(e1) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1) & a_young(s1) & Theme(s1,x1))