What have you done用的是现在完成时态，它表示从过去延续到现在，对现在造成的结果和影响。 …
Positive: You said it. Negative: You did not say it. = You didn't say it. Question: Did you say …
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 …
更多内容请点击：“what have you done”和“what did you do you”什么区别？ - 知乎