HAVE INFORMATION [I, T] › to have knowledge or information about something in your mind: "How old is she?" "I don't know." Andrew knows a lot about computers. [+ question word] Do you know where the station is? [+ (that)] He knew that she was lying. Do your parents know you smoke? BE FAMILIAR WITH [T] › to be familiar with a person, place, or thing because you have met them, been there, used it, etc before: I've known Tim since primary school. I grew up in Brussels so I know it well. Since moving to London, I've got to know (= become familiar with) some nice people. BE ABLE [T] › to be able to do something: [+ question word] Do you know how to ski? I only know (= understand and speak) a little Spanish.
let sb know › to tell someone something: Let me know if you're going to the party.
GUESS CORRECTLY [T] › to guess something correctly: I knew she'd arrive late. I should have known he wouldn't come. UNDERSTAND [I, T] › to understand and agree with someone: I know what you mean about Pete - I wouldn't trust him at all.
be known as sth › to be called something: California is also known as the Sunshine State.
have known sth › to have had experience of something: I've never known the weather be so hot.
know better (than to do sth) › to have the intelligence or judgment not to do something: She should have known better than to eat so much. No wonder she feels sick now.
I know › used when you agree with something someone has just said: "It's a lovely day, isn't it?" "I know - let's hope it lasts." › used when you have an idea: I know - let's go to Helen's house.
you know › used to emphasize that someone does know what you are referring to: You know, he's the one with curly hair. › something that you say while you are thinking what to say next: It's, you know, supposed to be a surprise. › used to emphasize what you are saying: I'm not an idiot, you know.
as far as I know › used to say that you think something is true, but cannot be sure: As far as I know, he's never been in prison.
you never know › used to say that something could be possible although it does not seem likely: You never know - you might win the lottery.