Children participate in a game of tug-of-war.
Children play tug-of-war at a school event.
Children participating in a game of tug-of-war are not necessarily at a school event.
exists e1 x1 x2 x3.(in(e1,x2) & of(x2,x3) & n_tug-of-war(x3) & n_game(x2) & Actor(e1,x1) & v_participate(e1) & n_child(x1))
exists e1 x1 x2 x3 x4.(at(e1,x3) & n_event(x3) & of(x3,x4) & n_school(x4) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tug-of-war(x2) & n_child(x1))