Isn't the classroom cleaned by the students every day?如何改为主动语态?

问题描述:

Isn't the classroom cleaned by the students every day?如何改为主动语态?
句子如题.为什么.
也就是说否定的疑问的被动语态怎样改为相应的主动句.

如果不明白,可以一步一步来变:
1 否定疑问句变否定陈述句:
Isn't the classroom cleaned by the students every day?
The classroom isn't cleaned by the students every day.
2 否定句变肯定句
The classroom is cleaned by the students every day.
3 被动句变主动句
The students clean the classroom every day.
4 肯定主动句变否定主动句
The students don't clean the classroom every day.
5 否定陈述句变否定疑问句
Don't the students clean the classroom every day?