I know you've all been working very hard recently and we've been exceptionally busy, especially with the wedding last weekend and the trade fair straight after that.

我知道你们最近工作都很努力，我们也特别忙，尤其是忙着上周末的婚礼和紧接着的交易会。

youdao

I know that he has tried hard; be that as it may, his work is just not good enough.

我知道他已经尽力了，尽管如此，他的工作仍不太理想。

《牛津词典》

I know it is hard to talk him of giving up that plan.

我知道你要说服他放弃那个计划是很困难的。

youdao

"I never done it in my life - I don't,know kind of hard, that's why I am still here - unemployed."

VOA: standard.2010.05.15

that may seem hot here it's a little hard and the dialogue is very interesting in that point cuz the prince says: "I know you think you can love me."

也许有爱情的成分,这有点为难,那些对话也十分的有趣,王子说：,我想你认为你可以爱我“

麻省理工公开课 - 电影哲学课程节选

and just, you know, work hard and study, do your homework, eat well too, I'm sure that helps

所以，我的建议是，努力学习，认真完成作业，
同时也好好吃饭，这真的很重要哦。

如果是在考虑留学 - SpeakingMax英语口语达人

And I know that if hard work could make the difference for me, then it can make a difference for all of you.

WHITEHOUSE: The President��s Back to School Speech

Things that are so random and quirky that as a writer, I know how hard that stuff is to invent, and it really had the ring of truth to it.

CNN: Sebastian Junger: The bin Laden tape and the war in Afghanistan

"All I know is that I worked very hard in the last two years, " he said.

BBC: Metropolitan Police Chief Superintendent Ali Dizaei