navi1-8  Exercise 1: Building Ngaru lu fpom srak?
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  Ngaru     nga + the dative -ru      "to you"
  lu        "to be"
  fpom      "peace, well-being"
  srak      question marker (srake when something follows)

Literally "is to-you peace?", the "has" pattern of Chapter 7. Meaning:
"Are you well?"

Answers:
  Srane.   yes
  Kehe.    no

Na'vi needs no word for "do" or "are" because the question is marked by
srak (or by rising intonation) and the verb is just lu, the same as in a
statement.