How to say in Czech: Do they understand him?

English
Do understand
Option 1 Option 2
Czech
Rozumějí mu?
They do not understand him.
They understand him.
Nobody understands him.
Nobody understands him here.
Do they understand?
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.
That’s something they will never understand.

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