Lambs on a grassy hill.
There are animals on a hill.
Lambs are animals.
exists s1 x1 x2.(a_topic(x1) & on(x1,x2) & n_hill(x2) & a_grassy(s1) & Theme(s1,x2) & n_lamb(x1))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_hill(x3) & n_animal(x2))