Now when the trumpet enters something of interest happens.

当小号进入时,有趣的事情发生了

耶鲁公开课 - 聆听音乐课程节选

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

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。

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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

I'm going to" is going to be very useful for you to refer to what's going to happen in the future.

I'm going to”在形容将来会发生的事情时，是一个非常有用的句型。

I'm going to 课堂 - SpeakingMax英语口语达人

If I were" is useful for talking about things that you hope for, things that you imagine to happen,

If I were”在谈论你渴望的事情和想象会发生的事情时非常有用。

If I were 课堂 - SpeakingMax英语口语达人

As I mentioned, you can also use "I wish" when you express something that you do not want to have happen.

就像我之前提到的，当你想说明你不希望发生的事情时，你也可以用“I wish”。

I wish 课堂 - SpeakingMax英语口语达人

And it's a way to communicate how you feel that about this possibility is not existing for you.

当你想谈论一些不会在你身上发生的事情时，你可以用“If I were”句型来跟人交流。

If I were 课堂 - SpeakingMax英语口语达人