Men, women and children dance at a party.
There are people dancing.
Dance at a party is more descriptive than just people dancing.
exists x1 x2 x3 x4 x5 x6.(a_topic(x1) & rel(x1,x2) & subset_of(x4,x2) & at(x4,x6) & n_party(x6) & n_dance(x4) & of(x4,x5) & n_child(x5) & subset_of(x3,x2) & n_woman(x3) & n_man(x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_dance(e1) & (x2 = x3) & n_people(x2))