This my sister.改为一般疑问句并作肯定回答 That's

This is my sister.改为一般疑问句并作肯定回答
Is this your sister?
Yes,she is
That's my brother.改为否定句
That's not my brother
That is my sister改为复数形式
Those are my sisters
This is his cousin.改为复数形式
These are their cousins
I'm Mike Smith.改为一般疑问句
Are you Mike Smith?