按要求改写句子。
1. Our bags are on the desks. (改为单数句)
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2. You can play the violin. (改为否定句)
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3. There are seven days in a week. (对画线部分提问)
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4. She is cleaning the windows. (改为一般疑问句)
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1. My bag is on the desk.
2. You can't / can not play the violin.
3. How many days are there in a week?
4. Is she cleaning the windows?