How to say in Czech: How do you know that?

English
How do you know that?
Czech
Jak to víš?
You do not know how you feel.
You didn’t write that.
How should I know that?
You are young.
I don’t know what you mean by that.
How much did that cost you?
How much did you pay for that?
How do you say that in Arabic?
How do you spell that?
Do you know Miss Nováková?

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