none既可指人,也可指物,且一定是特指概念,常用来回答how many/much;no one只能指人,且只能是泛指概念,常用来回答who引导的疑问句;nothing"什么也没有",否定一切,常用来回答what引导的疑问句。 〔误〕There were 20 people around but no one helped the old man. 〔正...