the room must be kept wet.变成被动语态!

the room must be kept wet.变成被动语态! The medicine must be kept cool不是说系动词没有被动语态吗 I must clean the room.改成被动语态 I saw the boy enter the room变成被动语态 变成被动语态 The students ciean the room ecery day. 初二被动语态Must i finish the homework改为被动语态是Must the homework be our room must be kept clean.中的keep不是系动词么,怎么用被动态 Wet must look after the children well.怎么改为被动语态啊 将下列主动语态变成被动语态:We hear the girl sing in the next room . Water must be kept from running away.这里面keep系动词不是无被动语态会进行时态吗 We must keep the air in the room clean.(改为被动语态） there must be 有被动语态吗