People standing on a bridge over a creek.
The people are sitting.
People cannot be standing and sitting at once.
exists e1 x1 x2 x3 x4.(a_topic(x1) & over(e1,x4) & n_creek(x4) & on(e1,x3) & n_bridge(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))
exists e1 x1.(n_people(x1) & Actor(e1,x1) & v_sit(e1))