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

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

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