Lambs on a grassy hill.
Lambs feed on the grassy hill.
Just because the lambs are on a hill doesn't mean lambs feed.
exists s1 x1 x2.(a_topic(x1) & on(x1,x2) & n_hill(x2) & a_grassy(s1) & Theme(s1,x2) & n_lamb(x1))
exists s1 x1 x2 x3.(n_hill(x3) & a_grassy(s1) & Theme(s1,x3) & a_topic(x1) & on(x1,x3) & n_feed(x1) & (x1 = x2) & ne_nam_lambs(x2))