The dog walks across the stream on a fallen log.
The dog fell into the pond.
The dog that fell into the pond cannot be the dog that walks
exists e1 s1 x1 x2 x3.(n_stream(x2) & n_dog(x1) & on(e1,x3) & n_log(x3) & a_fallen(s1) & Theme(s1,x3) & across(e1,x2) & Actor(e1,x1) & v_walk(e1))
exists e1 x1 x2.(n_pond(x2) & n_dog(x1) & into(e1,x2) & Actor(e1,x1) & v_fall(e1))