People are sitting on the edge of a large reflecting pond.
a group of people talking
Not all people who are sitting on the edge of a reflecting pond are talking.
exists e1 e2 s1 x1 x2 x3.(n_edge(x2) & on(e1,x2) & of(x2,x3) & n_pond(x3) & Actor(e2,x3) & v_reflect(e2) & a_large(s1) & Theme(s1,x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & of(x1,x2) & Actor(e1,x3) & v_talk(e1) & (x2 = x3) & n_people(x2) & n_group(x1))