I know you did it—I just want to know why.

我知道这是你干的，我只是想知道为什么。

《牛津词典》

I just want to know the facts.

我只想知道事实。

youdao

SON: "I just want to know."

儿子：“我只是想知道。”

youdao

I just want to know the bottom line; how much do I have to pay for the whole company?

我只想知道底价,也就是买下整个公司最少要花多少钱

耶鲁公开课 - 金融市场课程节选

I don't want to go out to eat every night, you know. I just want home cooked food.

我不想天天晚上出去吃，我想要吃家常菜。

想吃中餐的时候 - SpeakingMax英语口语达人

And then the last thing I want to do, is just decide, you know, what do I do when I'm done.

决定，你知道的，当我完成循环后去做什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

And I just want to know, is that the firm position that the President will address?

WHITEHOUSE: Press Briefing

"I just want to know how far up this chain you're going to go, " said Sen.

CNN: Rumsfeld tells Congress of his 'failure'

So how -- I just want to know what's the reaction of the White House to that?

WHITEHOUSE: Press Briefing