Question

This is my sister.改为一般疑问句并做肯定回答？

Answer 1

要点如下：
1. 含be(am,is,are)动词的句子，疑问句直接把be移到主语前面，因为be是助动词。
2. 习惯上你我互换。
3. Is this your sister? 肯否回答：Yes, it is. No, it isn't.

Answer 2

一般疑问句：Is this your sister？
肯定回答：Yes，she is.
原句变为一般疑问句，be动词is提前，随着问答双方的转变，第一人称my变为第二人称your，再进行肯定回答即可。

Answer 3

Is this your sister? Yes, she is.

Answer 4

Is this my sister? Yes, this is your sister.

Answer 5

改为一般疑问句如下：
Is this your sister?
肯定回答如下：
Yes,this is.