如下：
1、事情就是这样发生的。
That is how it happened.
2、发生什么事情的时候可以鸣笛通知制动工。
One can whistle down the brakes when something happened.
3、他想知道发生了什么事。
He wondered what had happened.
4、这些事件是不可避免要发生的。
These events were clearly predestined to happen.
5、她详细叙述了一遍今天上午在公园中发生的一切事情。
She rehearsed everything that happened in the park this morning.
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