How to say in Czech: His Czech is getting better.

English
is getting better.
Czech
Jeho čeština se zlepšuje.
I do not speak Czech very well.
You speak Czech very well.
His Czech is very good.
How good is his Czech?
His native language is Czech.
Is he learning Czech on his own?
Czech is a difficult language.
Czech is difficult.
He is Czech.
He is from the Czech Republic.

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