句型转换，按括号内的要求转换下列句子，每空一词。

1. She finds that it isn't easy to learn English. (同义句)

    She finds              hard              learn English.

2. He used to smoke                          ? (完成反意疑问句)

3. They must clean their classroom after school. (变成被动语态)

    Their classroom must                           by them after school.

4. My Chinese teacher is creative and outgoing. (对划线部分提问)

                 is your Chinese teacher             ?

5. If a friend said something bad about me, I would not say anything. (同义句)

    If a friend said something bad about me, I              say             .