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

English
native language is
Czech
Jeho rodný jazyk je vietnamština.
Vietnamese is a difficult language.
His Vietnamese is getting better.
His Vietnamese is very good.
How good is his Vietnamese?
Is he learning Vietnamese on his 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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