按要求改写句子。
1. These are red apples. (改为一般疑问句)
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2. The ice cream is cold. (划线部分提问)
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3. I can hear a train. (改为否定句)
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4. Can you hear a plane? (否定回答)
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5. Is your bag blue? (改为肯定句)
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6. picture, a, is, on, of, a, pig, my, bag, (连词成句)
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