把下面句子改成一般疑问句和划线部分提问.
those desks are blue(are blue划线）
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the boy's name is mike(mike 划线）
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把下列句子改为复数形式.
It is a black dog.
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He is a studengt.
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My brother is in the room.
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Is she your sister?
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It is not a dog
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