navi1-8  Exercise 3: A Negative Question
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A sample answer.

Nga ke lu Txewì srak? asks: "Is the statement 'you are not a Txewi' true?"

If you are not a Txewi, that statement is true, so the answer is Srane
(the statement is true).
If you are a Txewi, the statement is false, so the answer is Kehe.

In English, "Aren't you a Txewi?" "No" can mean either thing depending on
the speaker, which is why English answers with a sentence. In Na'vi the short
answer follows the truth of the statement being asked about, not the
positive or negative wording of the question.

(This reading comes from a community article; check it with a fluent
speaker before relying on it.)