How to say in Czech: Are they learning Latvian on their own?

English
Are learning on their own?
Czech
Oni se učí lotyšsky jako samouk?
Are they learning Latvian?
They are learning Latvian.
Where did they learn Latvian?
How good is their Latvian?
Their Latvian is getting better.
Their Latvian is very good.
Their native language is Latvian.
Do they speak Latvian?
They do not speak Latvian.
They do not speak Latvian very well.

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