A child jumps on a sand dune.
Kids use sand dune to play.
A child is singular but kids is a plural term
exists e1 x1 x2 x3.(on(e1,x2) & n_dune(x2) & of(x2,x3) & n_sand(x3) & Actor(e1,x1) & v_jump(e1) & n_child(x1))
exists e1 p1 x1 x2 x3.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2.(Actor(e2,x1) & v_play(e2)) & n_dune(x2) & of(x2,x3) & n_sand(x3) & n_kid(x1))