帮我把下列英语句子改成被动语态形式的!

问题描述:

帮我把下列英语句子改成被动语态形式的!
1.Is the blackboard cleaned after every class?
2.Is your classroom cleaned by you every day?
3.Are the flowers/trees looked after by you?
4.Are you desks made of wood?
5.Is the computer used only by your teacher?

the blackboard is cleacned after every class
I cleaned the classroom everyday
I looked after the trees/flowers
the desks are made of wood
the computer is only used by the teacher