将问句改成被动语态，可以遵循以下步骤：

将问句转换为肯定句

例如：Do young kids enjoy classical music？ 转换为 Young kids enjoy classical music.

将肯定句转换为被动语态

将宾语提前至主语位置。

添加助动词be（根据时态选择适当的be形式，如am/is/are/was/were等）。

添加动词的过去分词。

如果需要，可以添加介词by和原句的主语（动作的发出者）。

例如：Young kids enjoy classical music. 转换为 Music is enjoyed by young kids.

将被动语态转换回问句

在被动语态的句子末尾添加问号。

例如：Music is enjoyed by young kids. 转换为 Is music enjoyed by young kids？

通过以上步骤，可以将问句成功转换为被动语态。

示例

原句：Do young kids enjoy classical music？

转换后的被动句：Is music enjoyed by young kids？

原句：Where did you build the bridge？

转换后的被动句：Where was the bridge built？

原句：Can they finish their homework today？

转换后的被动句：Can their homework be finished today？

通过这些步骤，你可以轻松地将问句转换为被动语态。希望这些信息对你有所帮助!