你确信他在说谎吗？我不相信他会干这种事。

Are you sure he was lying? I can't believe that of him.

《牛津词典》

或“我相信/我知道/我确信我们公司将会成为贵方的良好伙伴。”

Or, "I believe…" "I know…" or "I am confident that our company will be a good partner for you.

youdao

我确信(相信)你是对的。

I am sure you are right.

youdao

我相信你，你一定会通过的，我确信。

I have faith in you, you will pass, I am sure.

youdao

我相信你，你一定会通过的，我确信。

I have faith in you, you will pass, I am sure.

youdao