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怎样变这个主动句为被动语态?Theydon'tusetheroom(他们未使用该房间),变为被动语态,我觉得应是Theroomdoes'tusedbythem,而答案是Theroomisn'tusedbythem为什么是isn't而不是doesn't啊,

题目详情
怎样变这个主动句为被动语态?
They don't use the room(他们未使用该房间),变为被动语态,我觉得应是The room does't used by them,而答案是The room isn't used by them 为什么是isn't 而不是doesn't啊,
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答案和解析
被动形式的基本结构是be+动词过去分词,然后各种时态都在be上变化,不会存在助动词doesn't