How to say in Czech: He has known him for a long time.

English
has known for a long time.
Czech
On ho zná už dlouho.
Does he understand him?
He does not know him.
He knows him well.
He would like to get to know him better.
Where does he know him from?
I got to know him when I was a student.
Everybody wants to get to know him.
It happened a long time ago.
He has a long face.
Long time no see.

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