Young hockey players play on rollerskates.
Young hockey players play on the ice.
A person cannot use rollerskates on ice.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_rollerskate(x3) & Actor(e1,x1) & v_play(e1) & n_player(x1) & of(x1,x2) & n_hockey(x2) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(n_ice(x3) & on(e1,x3) & Actor(e1,x1) & v_play(e1) & n_player(x1) & of(x1,x2) & n_hockey(x2) & a_young(s1) & Theme(s1,x1))