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If you don't know the answer, just guess.
How do you know my name?
"Have they arrived yet?" "I don't know."
I knew she wasn't really happy.
I don't know where the money's coming from.
I need to know if she's made a decision yet.
I don't know anything about it.
We know for a fact that the fire was started deliberately.
We know from experience that unemployment makes the problem worse.
The ancient city is known to have existed in the region.
Some drugs are known to cause damage to unborn children.
The pilots were experienced and known to be very competent.
Some of you may know Ivan already.
She had known Nancy for years.
I felt I hardly knew my father.
used informally, in spoken language
used when you have no information and you are unable to guess the answer to a question
used when you do not know something and you feel annoyed that someone is asking you about it
used for saying that you don't know something because it is impossible for anyone to know it
used for saying that you know as little about something as the person who asked you about it
used for saying that something may be true, but you do not have enough information to know whether it is or not
This is the American English definition of know. View British English definition of know.
a sweet brown food eaten as a sweet or used for flavouring other food