I believe I can.

我相信，我能。

youdao

I can do it because I believe I can do it.

我能做到，因为我相信我能做到。

youdao

I will never resign myself to failure for I believe I can make progress if I keep trying.

我不会听任失败的摆布，因为我相信只要一直努力就能取得进步。

youdao

Cause she's been through the fire before And I believe she can take a whole lot more.

VOA: special.2010.07.02

Since I say you can believe you're going to die, yet you can't picture it from the inside.

既然我说你可以相信人是会死的，但是你无法想象那种感受。

耶鲁公开课 - 死亡课程节选

And he said, "Well, I believe there's a God, but honestly, I can't be sure there's a God.

之后他自答到,"我相信上帝,但说实话,我不能确定上帝的存在

耶鲁公开课 - 心理学导论课程节选

Dr. VINT: Well, I wish I could take credit for that but I don't believe that I can.

NPR: Technology Used To Boost Olympic Performance

So it's a tall ask, but I've got to believe I can beat him.

BBC: Sport - Alistair Brownlee ready for crucial Olympic qualifying year

I'm only going for them because I believe I can get them.

BBC: Harlequins 20-21 Wasps