How to say in Czech: They do not understand this word.

English
do not understand this word.
Czech
Oni nerozumějí tomuhle slovu.
Do they understand her?
They do not understand this at all.
They do not understand.
They do not understand her.
They do not understand what the problem is.
Do they understand?
I did not understand that.
That’s something they will never understand.
They are beginning to understand.
They understand.

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