The dog walks across the stream on a fallen log.
The dog walked across the fallen log.
If someone walks you can say they walked
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 s1 x1 x2.(n_log(x2) & a_fallen(s1) & Theme(s1,x2) & n_dog(x1) & across(e1,x2) & Actor(e1,x1) & v_walk(e1))