Four men and one woman are socializing at a party.
A group of people were  at the party.
A group of people are socializing at a party.
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_party(x4) & Actor(e1,x1) & v_socialize(e1) & n_woman(x3) & card_eq_1(x3) & n_man(x2) & card_eq_4(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists p1 x1 x2 x3.(n_party(x3) & at(x1,x3) & of(x1,x2) & n_people(x2) & n_group(x1))