Erendai

Number
Nouns have two numbers: singular and plural. The plural form is created by adding a suffix to a singular form; this is determined by the ending of the singular root form.

If the root ends in
 * An unstressed monophthong i or u, add -rá: ci - cirá
 * Any other unstressed monophthong, add -rí: mo - morí
 * A stressed monophthong, add -ni: fá - fáni
 * A diphthong with a stress in the second vowel, add -ren: cié - ciéren
 * Any other diphthong, add -nen: mái - máinen
 * A consonant and the vowel before it is stressed, add a: uél - uéla
 * A consonant and the vowel before it is unstresed, add án: cal - calán