按要求改写句子。
1. There are some apples on the table.(改为单数形式)
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2. This child is playing football. (改为复数形式)
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3. This is an orange.(对画线部分提问)
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4. There is a tomato in the bag(对画线部分提问)
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5. I have 6 pens.(对画线部分提问)
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