按要求改写句子。
1. This dog ishis. (对划线部分提问)
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2. They arefishing. (对划线部分提问)
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3. We read books in the classroom.(改为现在进行时态)
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4. He’s writing a letter. (改为一般疑问句)
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5. he, to, bed, at, goes, 9:00 (连成陈述句)
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