If you don't take my advice, you'll regret it, I promise you.

你若不听我的劝告，保管你会后悔的。

《牛津词典》

I promise you there are children in your community right now who need a safe place to land.

我向你们保证，现在你们的社区里有一些孩子需要一个安全的地方落脚。

youdao

I promise you it's worth it.

我向你保证这么做是值得的。

youdao

"I promise you this - things are going to return to normal."

VOA: standard.2010.06.14

And your roommate says, "Inside the envelope are facts about this milkshake that if--I promise you it is indeed the case-- if you knew these facts, " you would not drink the milkshake anymore."

而你的室友说，“在信封里面是关于奶昔的事实,如果，我保证里面是事实-,你知道了这些事实，你就不会再喝奶昔了“

耶鲁公开课 - 死亡课程节选

I promise I'll pay you back tomorrow.

我保证明天就还你。

I didn't 实战 - SpeakingMax英语口语达人

Listen to me, I promise you that no harm will come to the children.

NEWYORKER: The Slows

And I promise you we'll use every legitimate means to free your loved ones from captivity.

CNN: Iran-Contra Affair

So I promise you our problems can be solved, and our challenges can be met.

WHITEHOUSE: The White House