There are some knives in the box.【改为单数】

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Therearesomeknivesinthebox.【改为单数】Therearesomeknivesinthebox.【改为单数】Therearesomeknivesinthebox.【改为单数】T

There are some knives in the box.【改为单数】
There are some knives in the box.【改为单数】

There are some knives in the box.【改为单数】
There is a knife in the box.