quenya_grammar1-9  Exercise 3: Auta i lómë!
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  Auta    passes, departs     present of auta-
  i       the
  lómë    night
  = "The night is passing!"   (as quoted on the page from The Silmarillion)

Two irregularities of auta-:
  1. The stem changes: auta-, av-, va- (from wa-), so the forms differ
     (ava, avëa, vánë, auva).
  2. Some cells have two variants (vánë / avantë in the past; auva / autuva in
     the future), and the past vánë shows the stem va- (< wa-) with a long
     vowel.