How to say in Czech: Her Vietnamese is very good.

English
is very good.
Czech
Její vietnamština je velmi dobrá.
I do not speak Vietnamese very well.
You speak Vietnamese very well.
Her Vietnamese is getting better.
How good is her Vietnamese?
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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