How to say in Czech: Vietnamese is a difficult language.

English
is a language.
Czech
vietnamština je těžký jazyk.
Vietnamese is difficult.
Her native language is Vietnamese.
I speak only a little Vietnamese.
How good is your Vietnamese?
Your Vietnamese is getting better.
Your Vietnamese is very good.
He is learning Vietnamese.
Is he learning Vietnamese?
Is he learning Vietnamese on his own?
Do you speak Vietnamese?

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