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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 were dirty marks on her trousers where she had wiped her hands.
这是一个复杂句。
There were dirty marks on her trousers where she had wiped her hands.
There形式主语或倒装引导词
werebe 动词
dirty marks on ··· hands.真实主语
where she had wiped her hands.
这是一个定语从句,其时态为过去完成时。
she主语
had wiped •••谓语动词短语(复合结构)
her hands.宾语