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可尝试扩展句子。越复杂的句子,分析结果越丰富。
It's high time that they got down to doing the homework.
这是一个复杂句。
It's high time that they got down to doing the homework.
It形式主语
'sbe 动词
high time表语(形容词)
that they got ··· homework.真实主语
they got down to doing the homework.
这是一个主语从句,其时态为一般过去时。
they主语
got down to •••谓语动词短语
doing the homework.宾语