English Plural Morpheme 2

the plural morpheme or the morpheme {-s} is not always realized by the suffix –s. The following are the examples:

man (singular) + -s ---> men (plural)
woman (singular) + -s ---> women (plural)
child (singular) + -s ---> children (plural)
ox (singular) + -s ---> oxen (plural)
tooth (singular) + -s ---> teeth (plural)
foot (singular) + -s ---> feet (plural)
sheep (singular) + -s ---> sheep (plural)
deer (singular) + -s ---> deer (plural)