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

English
do not understand this at all.
Czech
Vůbec tomu nerozumějí.
Do they understand her?
They do not understand this word.
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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