When you want a point particle, if you wake up and find a point particle on your bed, what's your reaction?

当你想要一个质点,想当你醒来时发现一个质点在你的床上,你是什么反应

耶鲁公开课 - 基础物理课程节选

You will find this pattern very useful anytime you're not feeling happy about something and you want to express yourself.

你会发现，当你因为什么事感到低落，你想表达自己的感觉时，这个句型特别有用。

I get so upset 课堂 - SpeakingMax英语口语达人

So when you see her and when you decide what you're going to do for the evening,

所以当你见到她，想要决定今晚做点什么的时候，

Let me 课堂 - SpeakingMax英语口语达人

You can say like, if you are trying to describe something, you can say like,

你可以这样说，当你想描述什么东西的时候，像这样，

紧张是学英语的敌人 - SpeakingMax英语口语达人

And just when you wake up, think, "Right, what do I want to wear today?"

当你醒来的时候，会想，“对了，今天我想穿什么呢？”

时尚让人兴奋 - SpeakingMax英语口语达人

So if you're impure at home and just minding your own business, it's no big deal. It's only a problem if you decide you want to go to the sanctuary. So purity and impurity are states of qualification or disqualification for contact with sancta.

如果在家的时候不纯洁，一心只关注自己的事情，这倒不是什么大事，只有当你想去圣所的时候,才是个问题，因此纯洁和不纯洁只是表明了,你是否有资格接触圣所。

耶鲁公开课 - 旧约导论课程节选

Use this pattern when you wish to express what you are doing right now.

当你想表达目前你正在做什么的时候，你就可以用这个句型。

I'm ~ing 课堂 - SpeakingMax英语口语达人