变成特殊疑问句应该用特殊疑问词引导吧 所以 我觉得应该是 对不同的对象有不同的问法 比如说 对mary :who bought some apples yesterday?这里应该不用变
对 动作 ：what did mary do yesterday?此处觉得应该为它的特殊疑问句
对事物：what did mary buy yesterday?
对时间：when did mary buy any apples?这个地方要变成any
差不多就这么些