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相似短语
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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 missing boy was last seen playing near the river.
这是一个简单句,只含有一个主谓结构。
The missing boy主语
was seen {主补}谓语动词短语(复合结构)(被动语态)
playing near the river.主语补足语(现在分词)
last