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可尝试扩展句子。越复杂的句子,分析结果越丰富。
Once a decision has been made, all of us should stick to it.
这是一个复杂句。
all of us should stick to it.
all of us主语
should stick to •••谓语动词短语(复合结构)
it.宾语
Once a decision ··· made,a decision has been made,
这是一个状语从句,其时态为现在完成时。
a decision主语
has been made谓语动词短语(复合结构)(被动语态)