A group of friends socializing at a barbecue.
People aren't talking at a barbecue.
Socializing can not take place if people aren't talking.
exists e1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x4) & n_barbecue(x4) & Actor(e1,x3) & v_socialize(e1) & (x1 = x3) & of(x1,x2) & n_friend(x2) & n_group(x1))
exists x1.(-exists e1 x2.(at(e1,x2) & n_barbecue(x2) & Actor(e1,x1) & v_talk(e1)) & n_people(x1))