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

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

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