How to say in Czech: They have known him for a long time.

English
have known for a long time.
Czech
Oni ho znají už dlouho.
Do they understand him?
They do not know him.
They know him well.
They would like to get to know him better.
Where do they 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.
Long time no see.
How long have they been here?

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