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

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

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