How to say in Czech: Their native language is Vietnamese.

English
native language is
Czech
Jejich rodný jazyk je vietnamština.
Vietnamese is a difficult language.
How good is their Vietnamese?
Their Vietnamese is getting better.
Their Vietnamese is very good.
Are they learning Vietnamese on their own?
He is learning Vietnamese.
Is he learning Vietnamese?
Vietnamese is difficult.
Do you speak Vietnamese?
I do not speak Vietnamese.

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