How to say in Czech: They have never seen him before.

English
have never seen before.
Czech
Nikdy ho neviděli.
They have never met him before.
They have not seen him here before.
That’s never happened to me before.
Do they understand him?
They have never heard of it.
They never forget anything.
That’s something they will never understand.
They may never be able to walk again.
They will never be alone.
They will never do it again.

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