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可尝试扩展句子。越复杂的句子,分析结果越丰富。
Should it rain tomorrow, we should have to put off the visit to the Great Wall.
这是一个简单句,它是复杂句的基础。
we主语
should have {to do.}谓语动词短语(复合结构)
to put off ··· Wall.to do.
Should it rain tomorrow,