How to say in Czech: Their English is getting better.

English
is getting better.
Czech
Jejich angličtina se zlepšuje.
I do not speak English very well.
You speak English very well.
How good is their English?
Their English is very good.
Their native language is English.
Are they learning English on their own?
English is a difficult language.
English is an international language.
English is difficult.
He is English.

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