English Phonetic Changes

st, sk, sp

When stressed, st, sk, and sp change their pronunciation;
The sound changes at the beginning of st, sk, and sp, while the end remains unchanged;
Sound changes: skate, skill, square, stand, sport, speak, study
No change in sound: interesting, inspiring

Voicing Correspondence

When a voiced consonant follows S and the syllable must be stressed, it changes to the corresponding voiced consonant.

Voiceless consonants: /p/, /t/, /k/
Voiced consonants: /b/, /d/, /ɡ/