题目内容：

句型转换

1.There are some English books in the desk (改为单数)

There ______   an English ______ in the desk.

2.This is my sister.(改为一般疑问句)

______ this  ______ sister?

3.They are my father’s  sisters. (改为同义句)

They ______ my  ______.

4.Are you a teacher? (作否定回答)

No, ______ ______.

5.It's an orange. (对划线部分提问)

_________  _________ this?