按要求写句子

1. This is my brother.(改为一般疑问句，并作肯定回答）    

________  _______your brother?  

Yes,                ________.

2. These are her friends.（改为否定句）  

These                _______her friends.

3. That is his book.（改为复数句）    

    _____     _____his________.

4. I am your grandfather.（改为否定句）    

I                  _______your grandfather.

5. Mary is my sister.（改为一般疑问句，并作否定回答）    

________  _______your sister?    

No,_________ _________.

6. He is my teacher.（对画线部分提问）    

   _______       ______he?