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可尝试扩展句子。越复杂的句子,分析结果越丰富。
It has often been said that life is difficult as it is.
这是一个复杂句。
It has often been said that life is difficult as it is.
It形式主语
has been said •••谓语动词短语(复合结构)(被动语态)
that life is ··· is.真实主语
oftenlife is difficult as it is.
这是一个主语从句,其时态为一般现在时。
life主语
isbe 动词
difficult表语(形容词)
as it is.it is.
这是一个状语从句,其时态为一般现在时。
it主语
isbe 动词