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

English
have known for a long time.
Czech
My ho známe už dlouho.
Do they understand him?
We do not know him.
We know him well.
We would like to get to know him better.
Where do we 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 we been here?

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