按要求改写句子。

1. Ourbagsareonthedesks. (改为单数句)
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2. Youcanplaytheviolin. (改为否定句)
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3. Therearesevendaysinaweek. (对画线部分提问)
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4. Sheiscleaningthewindows. (改为一般疑问句)
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1. Mybagisonthedesk.
2. Youcan't/ cannotplaytheviolin.
3. Howmanydaysarethereinaweek?
4. Isshecleaningthewindows?