否在did上面了 而时代在进步, 这个 助动词 在通常的句子里, 和动词连用的情况下, 人们发现, 说不说这个 …
You closed the door, did you? This is very different in tone. It suggests a skeptical, …
By this reasoning, “did you use to” is the only correct form. This is the conservative …
What did you do-> it means your friends or family doesn't know what you did or they …
did you"did you" is asking about something in the past which is not happening right now. …
更多内容请点击：how did和how was有何区别？ - 知乎