ELA21.3.36c

English Language Arts (2021) Grade(s): 3

A plural shows there is more than one of something.
An -s or -es suffix is added to the end of regular nouns and verbs for subject-verb agreement and to form plurals.
Possessives show ownership and an apostrophe is used in the formation of possessives.
A plural possessive is used when a plural noun has ownership, or possession, of something.
Some nouns and verbs do not follow the regular pattern when forming a plural.

There are standard English grammar conventions to make nouns, verbs, and possessives plural, and following these conventions helps make their writing clear.
Some nouns and verbs do not form plurals in a regular way.