I'll only relax when I know you're safe.

我只有知道你安然无恙才会放心。

《牛津词典》

She claimed to be 18, when I know she's only 16.

她自称是18岁，可是我知道她才16。

《牛津词典》

I'll only be relaxed when I know you are safe.

我只有知道你平安无事才能安心。

youdao

I know this is so, because when I put my small finger in front of the moon, my fingernail covers it."

VOA: special.2009.03.28

I know not what the younger dreams-- Some vague Utopia--and she seems, When withered old and skeleton-gaunt, An image of such politics.

我不知年幼者梦想什么-,某种模糊的乌托邦--她仿佛，当枯萎衰老瘦骨嶙峋的时候，这类政治的一个鬼影。

耶鲁公开课 - 现代诗歌课程节选

So I like, you know, waking up when I want to wake up, working out when I want to work out,

所以，我喜欢，你知道，想起床就起床，想锻炼就锻炼，

关于美军 - SpeakingMax英语口语达人

When I know my stuff, I can sometimes knock articles over in less than an hour.

FORBES: My Secrets: How I Became a Prolific Writer and Learned to Get Beyond School Essays

'But whenever I catch a glimpse of someone crying in the audience, that's when I know I'm dancing well.

BBC: The perfect trip: Andaluc��a

This is my hometown festival in some ways, and I only get nervous performing when I know people in the audience.

CNN: R. Kelly ignites Day 2 of Coachella