How to say in Czech: They just don’t know what to say.

English
just don’t know what to say.
Czech
Oni prostě nevědí, co říct.
I don’t know what to say.
They don’t know what to do anymore.
I don’t know what they mean by that.
He knows what they did last year.
He knows what they did yesterday.
I don’t know what it is.
I don’t know if they have the time.
They don’t know.
He knows what they think.
I know what they need.

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