I went to bed at half past nine变成特殊疑问句？

Question

如题所述

Answer 1

可以对时间at half past nine (在9:30）进行提问，疑问词用when，时态为一般过去时，助动词用did，主语I变you，went变go，答案如下：
When did you go to bed?本回答被网友采纳

Answer 2

可以变为：When did you go to bed?

Answer 3

I went to bed at half past nine变成特殊疑问句
When did you go to bed？