How to say in Czech: He just doesn’t know what to say.

English
just doesn’t know what to say.
Czech
On prostě neví, co říct.
He doesn’t know what to do anymore.
He doesn’t know what he means by that.
He doesn’t know.
He doesn’t know if he has the time.
He doesn’t want to go alone.
He doesn’t want to go there alone.
He doesn’t want to go to school.
He doesn’t want to hear it.
He doesn’t want to talk about it.
He doesn’t want to wait that long.

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