Look, if I tell you something, will you promise to keep it under your hat?

喂，如果我告诉你什么事情，你能答应保守秘密吗？

《柯林斯英汉双解大词典》

I want to tell you something!

我想告诉你们一件事！

youdao

Shall I tell you something?

要我告诉你一件事吗？

youdao

"Let me tell you something, disability doesn't care if you're young, old,rich,poor,black,white, green or purple.

VOA: special.2010.07.28

I tell you something about the second derivative of a function and ask you what is the function.

我告诉你一个函数的二阶导数,然后问你这个函数是什么

耶鲁公开课 - 基础物理课程节选

I mean, I can tell you about something really cool that I recently read in Herodotus,

我是说，我可以跟你说说我最近读希罗多德读到的很酷的东西。

神话有趣的课 - SpeakingMax英语口语达人

' Let me tell you something--there are a whole bunch of hardworking people out there.

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The very fact that these disclaimers are appearing on 401(k) statements should tell you something.

FORBES: 401(k)s: Far More Dangerous Than IRAs (March 2, 2001)

So let me tell you something -- it is time for us to get moving.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event