Final answer:
The sentence is grammatically incorrect due to a conjugation error.
Step-by-step explanation:
The sentence ¿Preguntas una chaqueta nueva para la Navidad? is grammatically INCORRECT as written. The verb preguntas should be conjugated in the second person singular to match the subject tú. The correct form would be ¿Preguntas una chaqueta nueva para la Navidad?
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