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【答案】1. This is my father. 2. Who is this girl? 3. This is my sister. 4. Is this your mother? 5. Yes. She's my mother.
【解析】
1.这是陈述句，这是This is ...（这是......）句型，我的爸爸是短语“my father”。故答案为： This is my father.
2.这是特殊疑问句，谁“who”，这位女孩是“this girl”，做主语，谓语动词用is。故答案为： Who is this girl?
3.这是陈述句，这是This is ...（这是......）句型，我的姐姐是短语“my sister”。故答案为: This is my sister.
4.这是疑问句句，这是This is ...（这是......）句型，一般疑问句is提前，你的妈妈是短语“your mother”。故答案为： Is this your mother?
5.这是陈述句，是的“yes”，第二句根据句意这是主系表结构的句子， 她“she”，是用is，我的妈妈“my mother”。故答案为： Yes. She's my mother.
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