I can, because I believe that I can.

我之所以能，是因为我相信能。

youdao

I believe that I can do anything if I try hard enough.

我相信如果我足够尽力去做的话，我能做任何事情。

youdao

Hence I believe that I can do a good job in this position.

因此，我相信我能做好这个职位。

youdao

Since I have not been informed that South Carolina declared war on the United States, I can only believe that this hostile act was done without your knowledge or permission.

VOA: special.2009.07.23

And of course,we don't have any good--as far as I can see-- we don't have any good reason to believe that crucial premise.

当然我们也没有很好的理由-,来相信这个重要前提。

耶鲁公开课 - 死亡课程节选

In any case, in this footnote Gadamer says something-- I think it's very rare that we can actually just sort of outright disagree with Gadamer, but he says something in this footnote that I believe we can actually disagree with.

无论如何，在此脚注中葛达玛提到一些东西-,我想我们不可能,彻底赞同葛达玛的观点，但在他的脚注中提到了一些,我很赞同的观点。

耶鲁公开课 - 文学理论导论课程节选

Now I believe that I can win matches from the first round to the final.

BBC: Sanchez lands second title

By being present and conscious, aware and awake, I believe that I can honor my brother, just a little bit, every day.

NPR: Living in the Here and Now

"I still believe that I can achieve a lot more, " Sharapova said.

WSJ: Who Can Upset Tennis's Untouchables?