Is this your cup?
It isn't my backpack.
~~~~~~~~~~～～~~~~祝你进步，如对你有帮助，请及时采纳~~~~~~~~~~~~~~~~
疑问句：
Is this your cup?
这是你的杯子吗？
否定句：
It is not my backpack.
这不是我的背包！
Is this my cup?
it isn't my backpack.
Is that your cup? It is not my backpack.
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