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

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

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