A referee is intervening in a hockey game.
a referee intervenes at a public hockey game
The game may be public or private.
exists e1 x1 x2 x3.(in(e1,x2) & n_game(x2) & of(x2,x3) & n_hockey(x3) & Actor(e1,x1) & v_intervene(e1) & n_referee(x1))
exists e1 s1 x1 x2 x3.(at(e1,x2) & n_game(x2) & of(x2,x3) & n_hockey(x3) & a_public(s1) & Theme(s1,x2) & Actor(e1,x1) & v_intervene(e1) & n_referee(x1))