what is happening是什么意思

Lots of things are happening here.许多事情正在这里进行着。
There have been strange happenings here lately.这里近来发生了一些怪事。
What is happening here is happening to Britain as a whole.在这里发生的事情也同样发生在整个英国。
想问“发生什么”，其他的说法：
what happened? 发生了什么事 ？
what's happening? 什么正在发生?
what has happened?(也可以缩写成what's happened?)已经发生了什么？ 

happen常指具体事件的发生，特别指偶然的或未能预见的事情：
A storm happened across the river in another country.
 如要指事先安排或有准备的事情或活动发生时，通常要用take place：
Great changes have taken place in our hometown during the past ten years.