在非限制定语从句中,什么时候as能替换which?它们所指代的都是一个句子~

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在非限制定语从句中,什么时候as能替换which?
它们所指代的都是一个句子~

as和which都可以代表整个句子,但二者的用法不同:as引导的定语从句可置于主句之后或主句之前,which引导的定语从句只能置于从句之后.
eg:He is a foreigner,which I know from his accent.
He is a foreigner,as I know from his accent.
As I know from his accent,he is a foreigner.
上面三句话表达意思基本一致,也体现了as和which的用法.他是一个外国人,我是从他的口音得知的.