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

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

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