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可尝试扩展句子。越复杂的句子,分析结果越丰富。
They lived on the earth tens of millions of years ago, long before humans came into being.
这是一个复杂句。
They lived on the earth tens of millions of years ago,
They主语
lived on •••谓语动词短语
the earth宾语
tens of millions ··· ago,、long before humans ··· being.humans came into being.
这是一个状语从句,其时态为一般过去时。
humans主语
came into •••谓语动词短语
being.宾语