Definition

to know: to be familiar with, to possess knowledge of, to understand verb
I don't know him. I have not met him, I am not familiar with him.
I know how to swim. I can swim.

This is an irregular verb:
I know / I knew / I have known
known: recognized, familiar, famous, renowned adjective
well-known widely-recognized, familiar, renowned
(What do you) know about (skiing)?: (What) can you tell me about (skiing)? idiom

UK: The verb "to know" is irregular: know/knew/known.
US: I know you love to conjugate verbs.
  • "KNOWN SUSPECT"
  • "And I know exactly what you should replace it with..."
  • "Well, in that case I don't know what to tell you, Dmitri."
  • "Cheating horses, know the rules"
  • "I know what you're going to say, and I'd be happy to kiss you at midnight."
  • "Everyone here knows you're jealous of Stink."
  • "Brian : You mean, you've never, you know...?"
  • "I don't know how you do it."
  • "You know, just hanging out, playing some golf, leading the free world, that sort of thing."

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