Sound changes from proto-Isles.

   -/s/, /X\/, /w/, /j/ and /?/ disapear at the beginning of words.
   -/a/ disapear at the beginning of words. Following /j/ and /w/ become /i/ and /u/.
   -/j/ and /w/ disapear when there not in coda.
   -/s/, /X\/ and /?/ turn to /h/ when not in coda.
   -Diphtongs simplify : /aj/ > /e/ ; /aw/ > /o/ ; /iw/ > /ju/ ; /uj/ > /wi/.
   -Vowel + coda consonant (including first articulation of an affricate) became long voyel :
      -/a/ + bilibial or dental > /e:/ ; /a/ + other > /a:/.
      -/e/ + bilibial or dental > /i:/ ; /e/ + other > /o:/.
      -/i/ + bilibial or dental > /i:/ ; /i/ + other > /u:/.
      -/o/ + bilibial or dental > /e:/ ; /o/ + other > /a:/.
      -/u/ + bilibial or dental > /i:/ ; /u/ + other > /o:/.
   -/ts/ and /dz/ simplify to /t_h/ and /d_h/.
   -Stops palatalized before /i/ and lenite before /e/ : /pi ti di ki gi/ > /p_hi tSi dZi k_hi g_hi/ ; /pe te de ke ge/ > /fe Te De xe Ge/.
   -/d/ changes to /t`/.
   -/j/ disapears before /i/.
   -/w/ disapears before /u/.
   -At the end of words /a:/ /e:/ /i:/ all reduce to /e/, while /a/, /e/, /i/ all reduce to nothing.
   -/t_h/ and /d_h/ simplify to /T/ and /D/.
   -Stacks of vowel simplify to /9/ if the first vowel of the stack is /a/, /j/ + second vowel if it's /i/, /ij/ + second vowel if it's /i:/, /w/ + second vowel if it's /u/, /uw/ + second vowel if it's /u:/, and to /y/ either. If one of the vowel is long, the resulting is long too. If both vowel are identical they simply merge into their long counter part.
   -Voiced consonant merge with unvoiced when possible.
   -Loss of final /h/.
   -Final /ij/ and /uw/ became /i:/ and /u:/.
   -Final /w/ and /j/ disapear.
   -/a:/, /e:/, /i:/, /o:/, /u:/, /y:/, /9:/ reduced to /A/, /E/, /I/, /O/, /U/, /2/, /a/.
   -/y/, /2/, and /9/ reduce to /i/, /e/ and /E/.