How to say in Czech: His Lithuanian is getting better.

English
is getting better.
Czech
Jeho litevština se zlepšuje.
I do not speak Lithuanian very well.
You speak Lithuanian very well.
His Lithuanian is very good.
How good is his Lithuanian?
His native language is Lithuanian.
Is he learning Lithuanian on his own?
He is learning Lithuanian.
Is he learning Lithuanian?
Lithuanian is a difficult language.
Lithuanian is difficult.

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