keep在这句中有么有被动语态 All the computers must_______（keep）clean and

老师让我们保持教室干净被动语态 keep ourclassroom clean and quiet by the tea We must keep the air in the room clean.(改为被动语态） 被动语态讲解We always keep the classroom clean.改成被动语态? 把下列句子变被动语态11.you should keep the room clean and tidy.12.He i 这个句子的被动语态：we must keep the classroom clean 谢 初中英语变为被动语态we must keep our classroom clean we must keep our classroom clean改被动语态 We should keep our room clean 改被动语态 How did you keep your classroom clean?变为被动语态. I always keep my room clean.变被动语态 We should keep our rooms clean and the air fresh all the tim keep有没有被动语态