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

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

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