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As everybody knows,Taiwan belongs to China.这句话是非限定性定语从句吗?

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As everybody knows,Taiwan belongs to China.这句话是非限定性定语从句吗?
当as,在句首时,怎么区分是不是非限哦?
As everybody knows,Taiwan belongs to China.这句话是非限定性定语从句吗?
我敢肯定楼上的错了.
错在as引导的是从句,但它并不属于非限制性定语从句!
我给你详细讲讲:
非限制性定语从句:
非限制性定语从句对所修饰的词或句子没有限制词义的作用,而只是作一些补充说明,通常有一个逗号把它和句子的其它部分分开,在翻译成中文时,这个从句多译成并列句.限制性定语从句中把从句拿掉以后,句子意思发生变化,而非限制性定语从句中把定语拿掉后对剩下的部分没有多大影响.如:
I picked the apples,some of which are badly bruised.
(some of which...f which some...)
as也可作为关系代词,可引导定语从句,很多时候与such连用,如:
we have such grapes as you never saw.
as也可单独引导定语从句,如:
he was a foreigner ,as I knew from his accent
也可放于句首,即:as I knew from his accent,he was a foreigner
但是要记住,as引导的从句并不属于非限制性定语从句,而是其它一些从句.
由此可以看出,As everybody knows,Taiwan belongs to China.中
as引导的是从句,但是它不属于非限制性定语从句,不在非限制性定语从句的范畴.
上句可改为:Taiwan belongs to China,As everybody knows.