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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 need for us to discuss the problem again since it has already been settled.
这是一个复杂句。
There is no need for us to discuss the problem again
There形式主语或倒装引导词
isbe 动词
no need for ··· again真实主语
since it has ··· settled.it has already been settled.
这是一个状语从句,其时态为现在完成时。
it主语
has been settled谓语动词短语(复合结构)(被动语态)
already