"Where is he from? - I do not know."

Translation: Звідки він? - Я не знаю.

[Pejiver]

Is it always necessary to include the personal pronoun in a sentence, even when the verb already tells you the person? Is only "ya ne znayu" correct, or should "ne znayu" work aswell?

[skstudio]

"Не знаю" is OK in this case, but sounds very colloquial. Usually, personal pronouns cannot be omitted in Ukrainian and it is better to use them always until you have enough experience.

[Pejiver]

OK, thank you :)

[Konrad-Michal]

Is він звідки? a possible translation?