was happened,was happening,happen,happened,happening的用法及区别

was happened不是“发生”的被动形式.因为happen是个不及物动词.不说“sth.is happened.”而直接说“sth.happened.”
was happening并不表示“正在发生”哦.你可以直接说“sth.is on"来表示正在上演（发生）至于was happening表示什么,我只能想到happening做名词“即兴表演”的意思.如果你有其他例句欢迎你告诉我.
happen自然不用说了,就是“发生”的原型.是个不及物动词.常用词组有：happen to do sth ;it happens that;sth happens to be……
happened 是happen的过去式.
happening除了刚才说的名词含义之外,what's happening?表示“发生了什么事”.