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将下列各句改为一般疑问句并且给出简短的肯定和否定回答

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将下列各句改为一般疑问句并且给出简短的肯定和否定回答
1.The desks are very heavy.
2.Mary is doing her homework now.
将下列各句改为一般疑问句并且给出简短的肯定和否定回答
1.Are the desks very heavy?
肯定回答:Yes,they are.
否定回答:No,they aren't.
2.Is Mary doing her homework now?
肯定回答:Yes,she is.
否定回答:No,she isn't.