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可尝试扩展句子。越复杂的句子,分析结果越丰富。
John was late for the business meeting because his flight had been delayed by a heavy storm.
这是一个复杂句。
John was late for the business meeting
John主语
wasbe 动词
late for the ··· meeting表语(形容词)
because his flight ··· storm.his flight had been delayed by a heavy storm.
这是一个状语从句,其时态为过去完成时。
his flight主语
had been delayed谓语动词短语(复合结构)(被动语态)
by a heavy storm.