句型转换：1、We clean our classroom twice a day .(改为被动语态）Our classroom ____ ____ twice a day .2、The teacher gave me a book .(改为被动语态)I ___ ____ a book by the teacher .3、Is the song sung by Sun Nan (改为主动语态）____ Sun Nan ____ the song 4、The boss made the workers work 12 hours a day .(改为被动语态）The workers ____ ____ ____ ____ 12 hours a day by the boss .

Our classroom is cleaned twice a day.
I was given a book by the teacher.
Did Sun Nan sing the song ?
The workers were made to work 12 hours a day by the boss.

1. is cleaned

2. was given

3. Does... sing

4. were made to work


祝你学习进步，更上一层楼！ (*^__^*)
不明白的再问哟，请及时采纳，多谢 !

1.is cleaned
2.was given
3.Does...sing
4.were made to work
不明白的再问哟,请及时采纳,多谢 !

答案依次是：
1. is cleaned
2. was given
3. Did sing
4. were made to work
答案保证准确，希望帮到你！