How to say in Czech: They do not understand it.

English
do not understand
Czech
Oni tomu nerozumějí.
Do they understand it?
They do not understand.
They do not understand this at all.
They do not understand this word.
They do not understand what the problem is.
Do they understand?
They understand it.
They understood most of it.
I did not understand that.
That’s something they will never understand.

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