to be certain about what you believe or want

to accept your position within society, an organization, your family, etc. and to not want to improve it

I just get on with my job and do as I'm told - I know my place. 我只是按吩咐做好我的工作——我很守本分。

to have good practical skills and knowledge in a particular activity or subject

to be familiar with a place or organization and able to act effectively within it

If someone knows all the answers, they think they know much more than other people.

to know a lot about a subject or activity, or be very good at it

to be the most suitable person to have responsibility and make important decisions

When it comes to dealing with my own son, I think I know best. 对于我儿子的事情，我想我最有权威。

to be wise or moral enough not to do something

Sure, she's only six, but she's old enough to know better than to run off without us. 当然，她只有6岁，但也该知道不能离开我们乱跑。

I'm surprised at you behaving so badly - you ought to/should know better. 你表现这么差我很惊讶——你该学乖一点儿。

to know more than someone else because you have more experience and more skill

They thought the painting was a fake, but Shackleton knew better. 他们认为这幅画是赝品，但沙克尔顿更在行。

to know all the important facts in a situation, especially the unpleasant ones

You know the score - no payment till after the article is published. 你了解情况——文章发表后才付稿酬。

to have the skills and knowledge to do something effectively

You don't need to tell me - I know what I'm doing! 你不用告诉我——我能应付得了！

to understand a subject because of your experience

He doesn't know what he's talking about - he's never even been to Africa. 他在信口胡诌——他从没去过非洲。

used when you think that the person listening understands and so you do not need to say any more

You've got to give him a chance, you know what I mean? 你得给他一个机会，你明白我的意思吧?

to be familiar with how it feels to be or do something

She knows what it's like to go bankrupt - it happened to her 20 years ago. 她知道破产是什么滋味 — 20年前她就破产过。

If you know what's what, you have a lot of experience and can judge people and situations well.

Linda's been in the business for 30 years - she knows what's what. 琳达从事这一行已有30年了——她很懂行。

to know who to be nice to and what to do in order to get an advantage for yourself

If someone has a quality that knows no bounds, it is extreme.

Her generosity knows no bounds. 她极其慷慨大方。

to have never met someone and not know anything about them

Why should she lend me money? She doesn't know me from Adam. 她怎么会借钱给我？她根本不认识我。

to know nothing about a subject

I'm afraid I don't know the first thing about car engines. 恐怕我对汽车发动机一无所知。

If you are talking about a quality or an activity and you say that someone doesn't know the meaning of the word, you mean they do not have that quality or have no experience of that activity.

Work? He doesn't know the meaning of the word! 工作？他对工作根本一无所知。

And the irony of Phil talking about ethics. He doesn't know the meaning of the word. 菲尔谈论道德规范简直是个讽刺。他本身根本就是一个没有道德的人。

to be shocked and surprised because something unpleasant suddenly and unexpectedly happens to you

You wait till he starts working for Michael - he won't know what's hit him! 你等到他开始为迈克尔工作时——他就会不知所措了！

to feel very embarrassed

And then he started to sing. Well, I didn't know where to put myself. 接着他开始唱歌。唉，我简直尴尬极了。

to not know what to do or who to ask for help

When both her parents died, she didn't know which way to turn. 她的父母双双去世时，她不知道该如何是好。

to not know how to react in a particular situation

When she told me they were getting married I didn't know whether to laugh or cry. 当她告诉我他们要结婚了时，我简直不知该如何是好。

used when answering a question to mean that, judging from the information you have, the answer is no

"Is she especially unhappy at school?" "Not that I know of." “她在学校特别不高兴吗?”“据我所知没有。”

If you say there's no knowing, you mean it is impossible to be certain about something.

There's no knowing what she'll do if she finds out about this. 无从知晓她查出这事后会做些什么。

something you say when you are surprised by a piece of information. This phrase is often used humorously to mean the opposite

So they're getting married, are they? Well, what do you know! 这么说他们要结婚了，是吗？真想不到！

Well, what do you know! The Raiders lost again! 唉，你说怪不怪！突袭者队又输了！

used to say that someone would not recognize something even if it was obvious

She wouldn't know a bargain if she fell over one! 即便明摆着的好买卖她也看不出来！

you knowidiom informalB1 （用于话语衔接）你知道

B1 （用于提醒或解释）你知道

said before giving an opinion or a piece of information

You know something? I don't think I like that man. 听我说，我想我不喜欢那个人。

You know what? I think it's time to go home. 要我告诉你吗？我觉得该回家了。

said to mean there is a possibility that something good might happen, even if it is slight

You never know, she might change her mind. 很难说，她或许会改变想法。