How to say in Czech: Are you learning Vietnamese?

English
Are learning
Czech
Učíš se vietnamsky?
Are you learning Vietnamese on your own?
They are learning Vietnamese.
Where did you learn Vietnamese?
Do you speak Vietnamese?
You speak Vietnamese very well.
How do you say that in Vietnamese?
You do not speak Vietnamese very well.
How good is your Vietnamese?
Your Vietnamese is getting better.
Your Vietnamese is very good.

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