we must keep our room clean把主动句改被动句

we must keep our room clean把主动句改被动句 We should keep our room clean 改被动语态 we must keep our classroom clean改被动语态 We must keep our room clean.Dirt ... 初中英语变为被动语态we must keep our classroom clean our room must be kept clean.中的keep不是系动词么,怎么用被动态 We must keep the air in the room clean.(改为被动语态） Shall we ____(keep) our room clean? We must keep our school clean. oceans we keep must the clean.怎么连词成句. 请把一下主动句改被动句, 将下列主动句改为被动句 You must clean your watch once a year