How to say in Czech: He does not understand what the problem is.

English
does not understand what the problem is.
Czech
On nechápe, v čem je problém.
Does he understand her?
He does not care.
Does he like her eyes?
Does he like it?
Does he live here?
He does not understand.
He does not understand her.
He does not understand this at all.
He does not understand this word.
Does he understand?

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