People are gathered at a business conference.
A flock of birds flying.
A flock of birds are not gathered people.
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 x3.(a_topic(x1) & of(x1,x2) & Actor(e1,x3) & v_fly(e1) & (x2 = x3) & n_bird(x2) & n_flock(x1))