I certainly know that he has come.

我当然知道他来了。

youdao

I certainly know that, but I just want to see this year's sakura now!

我当然知道，但是现在的心情就是想看看今年的樱花啊！

youdao

I don't think we know exactly what's going to happen but it's certainly possible that we could get very slow growth over the next year or two.

我认为我们不能确切地知道接下来会发生的事情，但是我们肯定有可能在未来一两年内让经济缓慢好转。

youdao

But we certainly didn't have goals. I don't know if we had ever heard of Grammys at that point.

VOA: special.2010.04.19

So hopefully, the first experiment he did, which I know that they certainly did do was maybe it's just background noise, right?

做的第一个实验，我相信他们肯定,是这样做的？

麻省理工公开课 - 化学原理课程节选

I don't know if that's true of you, but it certainly is true of people of my generation.

我不知道你们是不是也这样,但对于我们这代人来说确实如此

耶鲁公开课 - 古希腊历史简介课程节选

My prediction is that it will probably come in June but I can't absolutely be certain of that and my prediction is that I know that we can win and my prediction is that we'll now pull together and we'll do enough to win but I know certainly that we can.

BBC: News Online

Mr. KAGAN: Well, I think, you know, I would certainly say that all of us, to some extent, were hoping at least that things were changing.

NPR: Role of U.S. Changing in New World Order

At the same time, I would say the folks that went down, I know that they were certainly trying to live above board, to cross the T's, to dot the I's, to do everything that they were told to do.

NPR: 5 min 45 sec