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
... with no husband present, and 16.6% are non-families. 13.2% of all households are made up of individuals and 4.4% have someone living alone who is 65 years of ag ...