Neytiri is under obligation by/from Mo'at to teach Jake the ways of the Na'vi.

Mo'at came down the (natural) stairway saying, “Get back, all of you!”

Mo'at, the Tsahik, is the only member of the Omatikaya who wears a poncho.

A: I believe Mo'at saw Neytiri.
B: No, the one who saw Neytiri was Eytukan.
(Here the speaker has chosen a word order that puts Eytukanìl at the end of the sentence to highlight the important, contrastive information—just as the English translation does, but less concisely than the Na'vi.)