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as引导的非限定性定语从句的问题,请赐教,

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as引导的非限定性定语从句的问题,请赐教,
as shown in the chart,great changes h ave taken place in the unemployment rate中的as引导的shown应该用被动语态啊即as is shown 可是这个例句为什么没用呢
as引导的非限定性定语从句的问题,请赐教,
两种句型有本质区别,但可以相互转化.
As is shown in the chart是非限定性定语从句,看来你已经了解.
as shown in the chart=as they are shown in the chart,这里的they指句中的主语great changes,as作为连词引导一个方式状语从句,意思是‘正如’,状语从句中,如果主从复合句主语相同,可以省略从句主语和助动词,而成为“连词 分词短语”结构.这时分词的逻辑主语是句子的主语:When reading in the classroom,I was careless and lost an English dictionary.
If given more time,I could have done it better.