问题描述：
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?
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?
问题解答：
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