句型转换。
1. The children are playing in the park. (单数句型)
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2. The birds are singing in the trees. (一般疑问句)
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3. I will go to the park. (用be going to句型改写)
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4. The girls are going to have a picnic in the park. (对划线部分提问)
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5. We're going to go to school at eight o'clock. (对划线部分提问)
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6. These dogs are very noisy. (否定句)
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