what happened to sb和what's happened to sb区别

what happened to sb和what's happened to sb区别 what happen to sb 还是 what happened to sb what doyou think happened to sb what happened to 和what happened Who happened to be the waitress?一直只知道What happened to sb.却不知道有Who happened to be sb.请问一下这两者有什么区别和联系吗?感激不尽! What Happened to Us Dear,what happened to what happened to she what happened to him? what happened to what happened to the what happened to you和what's happened to you的区别那个对? what happened to you 和what has happened to you有什么区别 what happened to 和 what had happened to的区别是什么? sth happened to sb和compared to为什么都用了过去式? What happened to you .翻译 求：What happened to you? What Happened To Us 歌词