How to say in Czech: How good is his Finnish?

English
How good is
Czech
Jak dobře umí finsky?
His Finnish is getting better.
His Finnish is very good.
How do you say that in Finnish?
I do not speak Finnish very well.
You speak Finnish very well.
His native language is Finnish.
Is he learning Finnish on his own?
Finnish is a difficult language.
Finnish is difficult.
He is Finnish.

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