按要求完成句子。
1. They are cleaning the windows. (对画线部分提问)
______ ______ they ______?
2. Is he folding the clothes? (作否定回答)
_____, _____ _____.
3. the, Mom, dishes, washing, is (.) (连词成句)
_________________________
4. they, the, are, floor, sweeping (?) (连词成句)
__________________________
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