题目内容：

 

1.This is your sister.(改为一般疑问句)

                your sister?

2.This is my parent.(改为复数形式)

       are my        .

3.Those are my friends.(改为单数形式)

       is my         .

4.That is a pen. (改为否定句)

                   a pen.

5.That is a pencil.(对划线部分提问)

                    that?