We must clean our teeth twice a day.改为被动语态

We must ___ our ciassroom clean. We must keep our classroom (clean) every day we must keep our classroom clean改被动语态 初中英语变为被动语态we must keep our classroom clean We must help ______(keep) our enviroment clean. We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned We must keep our country ________.A.clean B.to clean C.cleaning D.cleaned we must keep our city ( )every day.yes,miss gao A.clean B.to clean C.cleaned Dcleaning we must make our classroom（）A、clean B、 cleaned C、cleaning Dto clean选择哪个?为什么? 分析一下句子成分（英语）谢谢We must keep our classroom tidy and clean. we must try our best to keep environment clean句子成份划分 We must clean our teeth twice a day.改为被动语态 we must clean our teeth before 什么 （go）to　　bed We must clean our classroom.改为被动句式的肯、否、一般疑问. we clean our classroom every We must clean their classroom, not_______(we) Miss Guo tells us something.She says we must keep our classroom clean.合并句子Miss Guo tells us ( ) ( )our classroom clean. We must keep our room clean.Dirt ...We must keep our room clean.Dirt and diseases go ___,you know.A.from time to timeB.hand in handC.step by stepD.up and down这道题选B,怎么翻译呢?Thanks!