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Resposta:
*They are singing*
*N:* They aren't singing
*I:* Are they singing?
*They are celebrating*
*N:* They aren't celebrating
*I:* Are they celebrating?
*The baby is sleeping*
*N:* The baby isn't sleeping
*I:* Is the baby sleeping?
*He is riding a bike*
*N:* He isn't riding a bike
*I:* Is he riding a bike?