她不得不掐一下自己，弄清楚自己不是在做梦。

She had to pinch herself to make sure she was not dreaming.

《牛津词典》

这不是在做梦。

This is not dreaming.

youdao

看到这样的对手，我实在不确定我是不是在做梦。

I wasn't sure if I was dreaming, seeing such an opponent.

youdao

How do I know," Descartes said, "I'm not dreaming right now?"

我又如何能确定我现在不是在做梦呢"

耶鲁公开课 - 心理学导论课程节选