问题描述：
his backpack 改一般疑问句
It's his backpack 改一般疑问句
His telephone number is 535-2375 改一般疑问句
This is my grandmother 改否定句
It's his backpack 改一般疑问句
His telephone number is 535-2375 改一般疑问句
This is my grandmother 改否定句
问题解答：
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