A girl plays on a red toy.
The child is on a rocking horse.
the girl is not necessarily a child, and the red toy is not necessarily a rocking horse.
exists e1 s1 x1 x2.(on(e1,x2) & n_toy(x2) & a_red(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_girl(x1))
exists p1 x1.(n_child(x1) & exists x2 x3.(on(x1,x2) & n_horse(x2) & of(x2,x3) & n_rocking(x3)))