stem change e:ie

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Across
  1. 3. verb is comenzar, form is tú
  2. 6. the type of tense the vowel changes in
  3. 7. forms that apply to the stem change e:ie
Down
  1. 1. verb is pensar, form is yo
  2. 2. verb in preferir, form is nosotros
  3. 4. change the ____ e if there are multiple e´s (first or second?)
  4. 5. a form that does not apply to the stem change rule (n)