1.That is your brother.改为一般疑问句2.Are these books?改为单数句

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1.That is your brother.改为一般疑问句2.Are these books?改为单数句
1.That is your brother.改为一般疑问句2.Are these books?改为单数句

1.That is your brother.改为一般疑问句2.Are these books?改为单数句
Is that your brother?
Is this book?