navi1-2  Exercise 3: Why Na'vi Is Hard for English Speakers
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A sample answer. Yours may differ.

Three sounds to learn from scratch
  - the ejectives px, tx, kx (a sharp, popped p, t, k)
  - the glottal stop ' as a real consonant (as in Na'vi)
  - the syllabic consonants ll and rr (they carry a syllable like a vowel)
  (also acceptable: starting a word with ng or with ts)

An English sound Na'vi lacks
  - b, d and g (Na'vi has no voiced stops)

A spelling trap
  - tx, px, kx, ts and ng are digraphs: one sound written with two letters.
    The x is not a separate sound, and ng is not "n + g" as in "finger".
  - Another trap: ì and ä look like i and a but are different sounds.
  - Another: stress is contrastive and learned per word, not a fixed rule.

Why it matters: English speakers tend to hear Na'vi through English habits,
so they add a g after ng, say x as a separate sound, or put stress where
English would. Learning each sound separately avoids that.