They know me—I'm a regular customer.

我是老主顾，他们都认识我。

《牛津词典》

It seems that they know what they're doing.

看来，他们知道自己在干什么。

《牛津词典》

Answer me this: how did they know we were here?

回答我这个问题：他们怎么知道我们在这儿？

《牛津词典》

Older women might be less likely to delay because they know that the older they get, the higher the risks.

VOA: special.2010.08.11

I began with their ideas of Japan and what did they know, because I knew that they knew very little.

我先让他们写了对日本的看法,和了解多少，因为我知道他们的知识很有限。

麻省理工公开课 - 媒体、教育、市场课程节选

But they know that we need the transportation and that we will pay for it, so there you go.

但他们知道，我们需要交通工具，我们会为之付钱的，所以你就知道了。

纽约的交通手段 - SpeakingMax英语口语达人

They know it's wrong to steal and burn down a CVS and an old persons' home.

CNN: Calling people 'thugs' solves nothing

Another problem: How do they know that money causes meanness, and not the other way around?

FORBES: Study: More Money Makes Managers Meaner

In fact, these folks are delighted to teach everything they know about a given topic.

FORBES: Be Humble and Teachable to Lay the Foundation of Success