This means you have facts or information about a person, place, or thing. It is used when you remember or are sure about something.
I know the answer to the question.
Do you know her name?
This use means you have met or been to someone or somewhere before. It says that you have a personal or direct experience.
I know this city very well.
She knows my family.
This meaning shows that you believe something to be true without doubt. It is used to show confidence in information.
I know he is coming tomorrow.
We know the facts are correct.
In this meaning, especially older or literary English, 'know' means to have a sexual relationship. It is a formal or old-fashioned use.
They knew each other before marriage.
The phrase 'to know a person' can mean intimacy.
Here, 'know' means understanding a situation or feeling inside. It is about personal awareness or judgment.
I know a good place to eat.
She knows when to help friends.
This use is formal and means that an authority or group accepts or admits something as official fact or rule.
The court knows her as the rightful owner.
The law knows no exceptions.
