【1】I like Saturday ,when?I can play computer games.【非限制性定语从句】=I like Saturday, on which?I can play computer games.我喜欢星期六,在这一天我能玩电脑游戏。【2】I like Saturday when?I can play computer games.【限制性定语从句】=I like Saturday on which?I can play computer games.我喜欢我能玩电脑游戏的那个星期六。