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

English
know what think.
Czech
Oni vědí, co si myslí.
He doesn’t know what they mean by that.
He knows what they did last year.
He knows what they did yesterday.
I know what they need.
They don’t know what to do anymore.
They just don’t know what to say.
What are you thinking about?
What do you think?
He thinks they are wrong.
He thinks they were wrong.

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