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

English
is getting better.
Czech
Jejich čeština se zlepšuje.
I do not speak Czech very well.
You speak Czech very well.
How good is their Czech?
Their Czech is very good.
Their native language is Czech.
Are they learning Czech on their own?
Czech is a difficult language.
Czech is difficult.
He is Czech.
He is from the Czech Republic.

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