we must keep classroom clean.这句中的must是什么词,做什么成份?

we must keep our classroom( ). We must keep ____(health) we must keep happy同义句转换we must keep happy___is____ ____ keep happy We must keep our classroom _________(tidily) 初一英语 we must keep our classroom_______. What must we have to keep healthy? We must keep our street s_______. 改错 We must keep the classroom cleanly. We must ___(keep) the classroom clean. We must keep the window______(open). we must keep the ( )on the road we must keep the( ) on the road we must keep( ) in the hospital we must keep the reading room quietly还是we must keep the reading room quiet ）We must keep quiet.=________quietWe must keep quiet.=________quiet(横线填一个单词) 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