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
... successful motorized railcar, the Autorail, and an airplane, but it never flew. Ettore Bugatti died on August 21, 1947 and is buried in Le Père Lachaise Cemetery ...