A group of young people sitting and talking.
the group of people are socializing.
People sitting and talking are not necessarily socializing.
exists e1 e2 s1 x1 x2 x3 x4.(a_topic(x1) & Actor(e2,x4) & v_talk(e2) & (x1 = x4) & Actor(e1,x3) & v_sit(e1) & (x1 = x3) & of(x1,x2) & n_people(x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))
exists e1 x1 x2.(n_group(x1) & Actor(e1,x1) & v_socialize(e1) & of(x1,x2) & n_people(x2))