People are gathered at a business conference.
Humans that gathered
People are humans.
exists e1 x1 x2 x3.(at(e1,x2) & n_conference(x2) & of(x2,x3) & n_business(x3) & Theme(e1,x1) & v_gather(e1) & n_people(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_gather(e1) & (x1 = x2) & n_human(x1))