按要求改写句子。
1. Is that your pencil box? (做出否定回答)
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2. The book is in my bag. (对划线部分提问)
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3. This is a clock. (变为一般疑问句)
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4. I am a pupil. (变为一般疑问句)
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5. Are you a boy? (做出肯定回答)
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