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
... years. For every 100 females there are 93.5 males. For every 100 females age 18 and over, there are 92.2 males. The median income for a household in the village is ...