Is this your sister?英语语法

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Is this your sister?英语语法
Is this your sister?No,it isn't.
Is that your brother?Yes,it is.
为什么这里的“your sister”、“your brother”在回答时要用“it”代替?可以用“she”或“he”代替吗?

可以,
当用this（that）来问问题时,要用it回答
同样地,these（those）出现在问题中时,用they来回答

Is this your sister?英语语法 Is this your sister Is this your sister是什么意思 Is this your sister?与Is she your sister?区别 This is your sister That is my Is this your sister?的答语是? IS this your sister?(改为复数句) Is this your sister的复数句? is this your sister的答语是 Is this your sister?否定回答 This is your sister.改为复数形式 Is this your sister 答语为什么要用it is.