How to say in Czech: His native language is Greek.

English
native language is
Czech
Jeho rodný jazyk je řečtina.
Greek is a difficult language.
His Greek is getting better.
His Greek is very good.
How good is his Greek?
Is he learning Greek on his own?
Greek is difficult.
He is learning Greek.
Is he learning Greek?
Do you speak Greek?
I do not speak Greek.

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