把一下句子改为被动态
问题描述：
把一下句子改为被动态
1.They have finished all the work.
2.He lelt the bok at school.
3.She will buy a new bike this month.
4.We must do today's worj today.
5.They are taking a photo.
答
All the work has finished by them.
The book was left at school by him.
A new bike will be bought this month by her.
Today's work must be done today by us.
A photo is being taken by them.