They are playing ice-hockey.
The kids are skating with sticks.
You can't assume this is a group of kids playing ice-hockey. It could be adults skating with sticks.
exists e1 x1 x2.(n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_ice-hockey(x2))
exists e1 x1 x2.(n_kid(x1) & with(e1,x2) & n_stick(x2) & Actor(e1,x1) & v_skate(e1))