a little boy sitts on top of a big rock.
a boy is in the forest
The boy doesn't need to be in the forest to be on a rock.
exists e1 s1 s2 x1 x2 x3.(on(e1,x2) & of(x2,x3) & n_rock(x3) & a_big(s2) & Theme(s2,x3) & n_top(x2) & Actor(e1,x1) & v_sitt(e1) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_forest(x2) & in(x1,x2) & n_boy(x1))