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

English
have known for a long time.
Czech
Oni nás znají už dlouho.
Excuse us.
Do they understand us?
It happened a long time ago.
They do not know us.
They know us well.
They would like to get to know us better.
Where do they know us from?
Long time no see.
How long have they been here?
How long have they been living here?

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