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可尝试扩展句子。越复杂的句子,分析结果越丰富。
There is no doubt that the boxes were then put on a train.
这是一个复杂句。
There is no doubt that the boxes were then put on a train.
There形式主语或倒装引导词
isbe 动词
no doubt that ··· train.真实主语
the boxes were then put on a train.
这是一个同位语从句,其时态为一般过去时。
the boxes主语
were put {介宾短语}谓语动词短语(复合结构)(被动语态)
on a train.介宾短语
then