They are two lovely pure white birds.(变They are two lovely pure white birds.(变成一般疑问句,并做否定与肯定回答)

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They are two lovely pure white birds.(变
They are two lovely pure white birds.(变成一般疑问句,并做否定与肯定回答)

Are they two lovely pure white birds?
yes,they are.
no,they are not.