Is that your backpack?(做否定回答） No,it isn't 解析：

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Is that your backpack?(做否定回答） No,it isn't 解析：
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Is that your backpack?(做否定回答） No,it isn't 解析：
Is that your backpack?(做否定回答） No,it isn't 解析：

Is that your backpack?(做否定回答） No,it isn't 解析：
回答时用it,指代问话中的that或this.
that是指示代词,指离说话人稍远一些的物品,回答中的it为人称代词(尽管是指物),代替所问的物品.因此回答时不再用that或this,而用it

这边用的是is提问的，否定回答也用is，所以变成No, it isn't.

Is that your backpack?

为一般现在时简单句

否定式
由no，主语及 前置助动词加not构成

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can you tell me?whose backpack is that?合并成一句我的答案can you tell me whose that backpack is我做的答案是错的,我认为宾语从句的从句应该是陈述句子才用的that backpack is 正确答案是can you tell me whose backpac Is that your computer? that is your pen. Is that ( ) your sister is that your friend? is that your desk? Is that your that is your bilk is------------- Is that your pencil是什么意思 Is that your sister?,回答 I hope that is your That is your pencil,__ IS THAT YOUR BYOTHERS是什么意思 Grrr!Is that your coat? Is that your final answer?; ) Is that your love.Not that ID card your is Is that your estate Yes,it is