This code does swap the two values, A and B. However, when I run this program, something happens.

这个代码没有交换那两个值，A和B，但是，当我运行这个程序时，有些事情发生了。

哈佛公开课 - 计算机科学课程节选

And it's useful for when you're talking about something in the moment that's going to happen.

当你在谈论马上就要发生的事情时，这个句型非常有用。

I'm about to 课堂 - SpeakingMax英语口语达人

And you would express this pattern if you're concerned about something that's about to happen,

当你对可能发生的事有所担忧时，你可以用这个句型来表达。

I'm worried 课堂 - SpeakingMax英语口语达人

So you're going to use it when you're talking about something that's happening

因此，当你在谈论某些发生的事情时，你可以使用这个句型。

so that 课堂 - SpeakingMax英语口语达人