I don't know if we can help—it all depends.

我不知道我们能不能帮上忙，一切都得看情况而定。

《牛津词典》

Eugene: I think there are people who do this, but I don't know it. I don't know all the details.

我知道有些人有做过搜索引擎优化，但是我不了解这方面的东西，我也不清楚具体的细节。

youdao

I don't know if it could happen or if it's desirable. All I know is I enjoy my freedom, and I'm happier than ever.

我不知道这种情景会不会出现或者是不是可取的，我所知道的只是我很享受我的自由，我比以往任何时候都要快乐。

youdao

- I don't know if it's worth it anymore.- We drove all the way out here. - JESSICA: I'm at least paddling out.- Yeah.

VOA: standard.other

I don't know it all that well personally.

我个人知道的不是很多。

愉快的卡姆登的夜晚 - SpeakingMax英语口语达人

Does anyone have that in their brain somewhere for ready use? I don't, in fact, so it's actually okay if you don't know all your common ions, if you missed that part.

你们有谁有印象它们有什么用吗？,我当时是不知道，所以如果你们不记得,这部分也没有关系。

麻省理工公开课 - 化学原理课程节选

"I don't know why it all got so silly, " Redknapp added.

BBC: Gennaro Gattuso given four-match ban for headbutt

At the rate it is increasing, I don't know if I will be able to tear it all out much longer.

FORBES: Time Wasters, Time Savers

"At this stage, I just don't know, so all I can do is acknowledge it's a possibility, " Cashman said.

NPR: Cashman: 'It's A Possibility' Jeter Misses Opener