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【答案】1. Who is this, Cindy? 2. She is my mother. 3. Who is that girl? 4. She is my sister. 5.Is he your father?
【解析】
1.这是疑问句，谁“who”，这是用This is 句型，这里跟在疑问词后面，用一般疑问句语序，is提前。故答案为： Who is this, Cindy?
2.这是陈述句，她“she”，和she搭配“是”用is，我的妈妈“my mother”。故答案为： She is my mother.
3.这是疑问句，谁“who”， 那个女孩“that girl”，搭配be动词“是”用is。故答案为： Who is that girl?
4.这是陈述句，她“she”， be动词和she搭配用“is”， 我的妹妹“my sister”。故答案为： She is my sister.
5.这是疑问句，他“he”，搭配的be动词用is，这是疑问句，is放到主语前面，你的爸爸“your father”。故答案为： Is he your father?
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