I know it's hard, know it's hard.

我知道这很难，知道这很难。

youdao

I know it's hard, but I will try my best.

我知道这很困难，但我会尽我最大的努力。

youdao

I know it's hard.

我知道这很难。

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

but it's hard because I wouldn't know what to choose.

但是，这很难，因为我不知道该选什么专业。

想开精品店 - SpeakingMax英语口语达人

It's sort of hard to put into words. I don't know.

VOA: standard.2010.02.28

"I know it's hard for people to understand what I'm doing, " she told reporters on 28 December.

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If you and I were to get together 30 years from now, I know it's hard to envision, what kind of conversation do you think we'll have?

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"I know it's hard to come back from, but I'm on it a lot earlier than I was last time, " said Noah, who missed 18 games with plantar fasciitis during the 2009-10 season.

WSJ: Bench carries Nets past Bulls, 93-89