How to say in Czech: How good is their Latvian?

English
How good is
Czech
Jak dobře umějí lotyšsky?
Their Latvian is getting better.
Their Latvian is very good.
How do you say that in Latvian?
I do not speak Latvian very well.
You speak Latvian very well.
Their native language is Latvian.
Are they learning Latvian on their own?
He is learning Latvian.
Is he learning Latvian?
Latvian is a difficult language.

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