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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 water companies were instructed not to expose people to polluted water any more.
简单句 包含的语法知识点都比较少,可以试试扩展成分让其变得复杂。
The water companies主语
were instructed {主补}谓语动词短语(复合结构)(被动语态)
to expose people ··· more.主语补足语(to do.不定式)
not