It is our duty to keep our classroom clean and tidy.这句话谁做主语谁做谓语

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Itisourdutytokeepourclassroomcleanandtidy.这句话谁做主语谁做谓语Itisourdutytokeepourclassroomcleanandtidy.这句话谁做

It is our duty to keep our classroom clean and tidy.这句话谁做主语谁做谓语
It is our duty to keep our classroom clean and tidy.这句话谁做主语谁做谓语

It is our duty to keep our classroom clean and tidy.这句话谁做主语谁做谓语
it是形式主语,真正的主语是后面的不定式短语to keep our classroom clean and tidy

形式主语,it
实际主语: to keep our classroom clean and tidy

谓语is