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可尝试扩展句子。越复杂的句子,分析结果越丰富。
If each would sweep before his own door, we should have a clean city.
这是一个复杂句。
we should have a clean city.
we主语
should have •••谓语动词短语(复合结构)
a clean city.宾语
If each would ··· door,each would sweep before his own door,
这是一个状语从句,其时态可以是一般过去时、一般过去将来时、一般现在时、一般将来时。
each主语
would sweep谓语动词(复合结构)
before his own door,