what happened?happen用过去式?详细

whatever what happened,orwill happen... 为什么用what happened 而不是 what happen what happened/what was happened/what is happened/what happen/what is happeniwhat happened/what was happened/what is happened/what happen/what is happening这些用法都有吗 what happened?happen用过去式?详细 happen用法what's happened to you What's happened toyou what happen to you what's happened to you What ____ you yesterday A happen B happen to C happened to D was happened to what happen to you还是what happened to you? what happened 和what did happen的区别 what happen和what happened有什么区别 what happen to sb 还是 what happened to sb what was happened 为什么不能用what was happen he walk over to see what happened...什么时候用what is happen 什么时候用what happen 英语翻译Do you know_____over there?A.what is happened B.what happened C.what did happen D.what was happened 请问：happen的用法.eg:what happened,what's happen的区别 What happened?中的happen不是动词吗?怎么不是写成What did happen? What do you think ____ (happen)?A to happen B happening C is happened D has happened 选择题what ______to him just now ? A.happen B.was happen c.was happened D.happened需要解析 They never knew what _______ in a hundred yearsA.will happen B.happened C.is happened D.would happen