A child plays on the dirt.
the child played on an ant hill
Not all dirt is on an ant hill.
exists e1 x1 x2.(n_dirt(x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))
exists e1 s1 x1 x2.(n_child(x1) & on(e1,x2) & n_hill(x2) & a_ant(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1))