Regular and Irregular Plural Nouns
Plural nouns name more than one person, place, thing, or idea.
Regular plural nouns are formed by adding -s or -es.
Sometimes spelling changes, such as changing y to i, are needed before you add -es.
Irregular plural nouns may take the same form as the singular noun or may require spelling changes.
Type How to Form Plurals Examples of Plurals
Regular +s valleys, lips
Regular +es lunches, dishes, cities
Irregular same form as singular deer, sheep, series
Irregular change spelling men, teeth, mice