发生什么事了?帮我翻译一下

两个都表示发生什么事了,但强调的语气不一样,第一个是现在完成时,用于陈述句的多；第二个是一般过去时,可用于陈述句和疑问句.还可以用现在进行时,what's going on （here）?
再比如：
That's because what has happened has happened.
这是因为已发生的事都已发生了.
A Underline all the verbs in the passage which tell us what happened and what has happened.
在课文中的所有动词下面划上横线,并指出哪些是一般过去时,哪些是现在完成时.
What has happened at the start of this season really all came from what happened at the end of last year,"he said.
我们这个赛季的良好开局和上个赛季末的表现息息相关.”他说.