我保证我一定会补偿你的。

I'll make it up to you , I promise.

《牛津词典》

我保证我的父母会很平静地处理！

I'm sure my parents will be totally cool with it.

youdao

我保证我下节课一定带来给你。

I promise I will bring it to you next lesson.

youdao

I guarantee, more than that In fact, the people who chose where we started off 33 chose in that range.

我保证,多很多的,实际上选33的人是在这个范围内选择的

耶鲁公开课 - 博弈论课程节选

And I said to my advisor, "No, no. I have taken chemistry in high school, and I can assure you that chemistry has no relevance whatsoever to the life sciences."

于是我就去和我导师说：,“我在高中学过化学，我向你保证化学和生命科学,没有任何关联“

麻省理工公开课 - 化学原理课程节选

Well I grew up in Michigan and I can assure you that Michiganders love all those things too and probably even more.

我在密西根州长大,所以我敢保证密西根人也很喜欢这些东西,甚至比南方人更喜欢

耶鲁公开课 - 美国内战与重建课程节选