Welcome to English in a Minute.

“In your dreams”是“我不相信你”（I don't believe you）或者“这不是真的”（there's no way that's true）的另一种表达方式。In your dreams! =做梦去吧！

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词汇：
in a playful manner 以有趣的方式

In American English, when someone responds to you by saying, "In your dreams!" does he mean that you're actually dreaming?

A: Guess what? This weekend, I caught a fish this big. B: No way.

A: Yeah, It was huge! B: In your dreams! There's no way you caught a fish that big.

"In your dreams" is a different way of saying, "I don't believe you" or "there's no way that's true."

It is a way to tell people that you think they are making up a story.

And this phrase is used in a playful manner, usually with a smile.

"In your dreams! In your dreams! In your dreams!" And that's English in a Minute.

本文节选自《English in a Minute》，VOA的一个教学栏目，用一分钟的时间介绍一个美式俚语，语速适中，标准美语。