How to say in Czech: They know what they need.

English
know what need.
Czech
Oni vědí, co potřebují.
They need to go home.
He doesn’t know what they mean by that.
He knows what they did last year.
He knows what they did yesterday.
He knows what they think.
They don’t know what to do anymore.
They just don’t know what to say.
What do you need?
And you know what?
I don’t know what it is.

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