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由as引导的定语从句有以下几种情况:
1) as作关系代词和关系副词引导限定性定语从句,并在句中做主语、表语和状语,构成the same……as, such……as等结构。
[例]I want to have such a dictionary as he has. (as 做宾语,指代: a dictionary)
I should do it in the same way as you did. (as 做状语,指代 :in the same way)
2) as引导非限定性定语从句。as 在定语从句中做主语、表语或宾语,该定语从句指代整个句子,可放于主句之前。
[例]The experiment is very important, as indeed it is.(as代表整个句子,作表语 )
As is known to all, he is the best studentin our class.(as代表整个句子,作主语)
As we all know, he studies very hard. (as代表整个句子,作宾语)
常用类似插入语有的句式有:
as is said above, as already mentionedabove ,as is known to all , as it is , as is often the case , as is reported inthe newspaper等。
注:
1) 关系代词在从句中做主语时,从句的谓语动词的人才和数必须和先行词保持一致;
2) 关系代词whom, which, that在限定性定语从句中做动词宾语或者介词宾语,而该介词又位于从句末尾时,经常省略,但as一般不省略;
关系代词which和as在定语从句中的区别是:which不能放在句首,as可以;在句中,as有“正如……”“就像……”之意,which无此意。
希望可以帮到你
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