If your child regresses to babyish behaviour, all you know for certain is that the child is under stress.

如果你的孩子退步到幼稚的行为，你可以肯定的是孩子正处在压力之下。

《柯林斯英汉双解大词典》

It must be worrying for you not to know where he is.

你不知道他的下落一定很着急。

《牛津词典》

Since you're going to university in England, do you know how much it is for international students to study there?

既然你要去英国上大学，你知道国际学生在那里学习要花多少钱吗？

youdao

I can start to cook food that is good for me,you know?

VOA: standard.2010.02.23

He spoke advancing toward her: What is it you see from up there always?--for I want to know."

他站在她面前：,“你在那里看什么呢？我想知道，“

耶鲁公开课 - 现代诗歌课程节选

So this is going to tell you pretty much everything you need to know in terms of getting ready for the exam, which is next Wednesday.

这上面包括了几乎,所有的你需要知道的,关于如何准备这次考试的信息，考试时间是下周三。

麻省理工公开课 - 化学原理课程节选

If you blow a scoring opportunity because you're selfish, you know the crowd are going to be baying for you, and you know who is going to be slammed in the paper the next day.

BBC: Ieuan Evans

So what you need to know is that when it comes time to stand up for American workers and American families, you know what my husband is going to do, right?

WHITEHOUSE: Remarks by the First Lady at a Campaign Event

You know, you just got to be ready for whatever this girl is going to come up with next because, you know, I'm always, you know that, I'm always cooking with gas.

NPR: Queen Latifah on 'Trav'lin' Light'