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可尝试扩展句子。越复杂的句子,分析结果越丰富。
The human beings have been able to keep a small, secret school open since the machines took over.
这是一个复杂句。
The human beings have been able to keep a small, secret school open since the machines took over.
The human beings主语
have beenbe 动词(复合结构)
able to keep ··· over.表语(形容词)
the machines took over.
这是一个状语从句,其时态为一般过去时。
the machines主语
took over谓语动词短语