How to say in Czech: Her Vietnamese is getting better.

English
is getting better.
Czech
Její vietnamština se zlepšuje.
Her Vietnamese is very good.
How good is her Vietnamese?
I do not speak Vietnamese very well.
You speak Vietnamese very well.
Her native language is Vietnamese.
Is she learning Vietnamese on her own?
He is learning Vietnamese.
Is he learning Vietnamese?
Vietnamese is a difficult language.
Vietnamese is difficult.

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