请问 what happened 是独立的句子么what happenen 能独立使用也能充当从句吧!

请问 what happened 是独立的句子么what happenen 能独立使用也能充当从句吧! 是What happened 还是what’s happened what happened 和what has happened 有什么区别么请问 发生什么事了?帮我翻译一下what has happened?what happened?请问第二种说法明明是疑问句.为什么要用happened呢?还是第二种表达是错误的? 请问What do you think happened to they? do you know anything about the accident__ in the street yesterday?A,happened B,happening C,which happened D,which was happened请问如果是分词作定语应该怎么选?C.D都打错了，应该是what. what happened with you? 还是 what happened to you? 哪个是对的? 是What happened 还是what’s happened为什么不能有‘s呢? 是what has happened to还是what has happened at快,还有后面加什么! What happened to the boy?He tried (avoid) answering my questions.请问是填to avoid还是avoiding, What had happened?What had happened?What had happened? what's happened 中的“s”是has吗?还是is?还是was?还是什么?what's happened和what happened有区别吗?如果别人问what's happened应该怎么回答?问what happened又该怎么回答? what happened=what's happened吗? what happened to 和what happened general statement of what happened when请问这句短语如何翻译?尤其是what happened when这一部分怎么讲? What happened next?这句话对吗?为什么要用happened如果是what happens next?或者what will happen next? What is happened?happened是形容词、名词还是动词?学语法乱了乱了 He asked,What has happened to you?变为间接引语该怎么变是He asked what had happened to me.还是He asked what I had happened .