How to say in Czech: How good is their French?

English
How good is
Czech
Jak dobře umějí francouzsky?
Their French is getting better.
Their French is very good.
How do you say that in French?
I do not speak French very well.
You speak French very well.
Their native language is French.
Are they learning French on their own?
French is a difficult language.
French is difficult.
He is French.

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