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

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