dothraki1-6  Exercise 3: Syncretism and Negatives
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Why dothrae is ambiguous
  For a vowel-final stem, the present endings for you (2SG), you (2PL),
  he/she/it (3SG) and they (3PL) are all -e, so dothrae is the same form
  for all four. The subject pronoun (yer, yeri, me, mori) tells the
  listener who is meant.

Negative first-person singular (built by rule)
  dothralat  stem dothra  -> dothrok   (vowel stem: -ok)
  astat      stem ast     -> astok     (consonant stem: -ok)