Example
The English plural morpheme for nouns has three allomorphs:
(notation in SAMPA)
from: Iggy Roca and Wyn Johnson, a course in phonology, Blackwell, 1999; p. 621
... of Christ", one of the most well known Christian books on devotion. I. Life, Minor Writings Thomas à Kempis, German mystic and author of the "Imitation of ...