navi1-10  Exercise 3: Differences from English
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A sample answer (any well-argued set is fine).

1. Infixes: Na'vi puts tense and attitude inside the verb (t<ay>aron),
   where English adds words ("will hunt").
2. Free word order: case endings mark who did what, so the order can move.
3. Base eight: counting goes 1-7, then vol (8), not 1-9 then ten.

What they share: both mark plural and tense on words, both ask yes/no
questions and negate with a small particle, and both have a word for
"hello" and "thank you" that speakers use constantly.