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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 wasn't until he came here that I knew the truth.
这是一个复杂句。
It wasn't until he came here that I knew the truth.
It强调句主语
wasn'tbe 动词
until he came here表语(介词+从句)(被强调成分)(原从句中的状语)
that I knew ··· truth.从句(抽离强调成分)
he came here
这是一个状语从句,其时态为一般过去时。
he主语
came {名词性副词}谓语动词短语
here名词性副词
I knew the truth.
这是一个从句,其时态为一般过去时。
I主语
knew •••谓语动词短语
the truth.宾语