How to say in Czech: Is he learning Latvian on his own?

English
Is learning on his own?
Czech
On se učí lotyšsky jako samouk?
He is learning Latvian.
Is he learning Latvian?
Where did he learn Latvian?
His Latvian is getting better.
His Latvian is very good.
His native language is Latvian.
How good is his Latvian?
Does he speak Latvian?
He does not speak Latvian.
He does not speak Latvian very well.

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