A greyhound running a race.
A greyhound is laying on its bed.
One cannot be running and laying simultaneously.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_run(e1) & n_race(x3) & (x1 = x2) & n_greyhound(x1))
exists e1 x1 x2.(on(e1,x2) & n_bed(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_lay(e1) & n_greyhound(x1))