I want him back, but I just don't know how to go about it.

我希望他回来，可我就是不知道怎么去做这件事。

《柯林斯英汉双解大词典》

But I just don't know how to distinguish myself.

但我就是不知道如何让自己与众不同。

youdao

The thing is, I just don't know how to make her notice me.

问题是，我不知道怎么才能让她注意到我。

youdao

He had a little electrical thing just on— I don't know how he thought to do this.

将一个小型的电极插在,不知道他是怎么想到要这么做的

耶鲁公开课 - 心理学导论课程节选

I held off for a very long time, but I just got mine a month ago. And now I don't know how I live without it.

我拖了好长时间，一个月前才买的。而且现在我不知道离开它该如何生活。

没有智能手机活不了 - SpeakingMax英语口语达人

I don't know how clear that all was; let me just write this down.

我不知道是否讲清楚了,我写下来吧

耶鲁公开课 - 金融市场课程节选

God forbid anything happens, I just don't know how they can say this without proving it.

BBC: Ofcom said there were 70 such cases in 2006

"I would hesitate to speculate on how long that would take, because I just don't know how much follow-up and additional information might be generated when we take a look at it, " said Dr. Ron DeHaven, deputy administrator of animal, plant and health inspection services for the U.S. Department of Agriculture.

CNN: Canada nears end of mad cow probe

So you just have to - I don't know how many of my friends or how many of my colleagues have learned to be in the moment.

NPR: Carly Simon's 'Never Been Gone'