a man runs from a bull at a rodeo.
A man sitting on a bull's back
The man cannot simultaneously run and be sitting on a bull's back.
exists e1 x1 x2 x3.(at(e1,x3) & n_rodeo(x3) & from(e1,x2) & n_bull(x2) & Actor(e1,x1) & v_run(e1) & n_man(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_back(x4) & of(x4,x3) & n_bull(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))