This document discusses types of plurals in English and the different ways nouns form their plural forms. It outlines the main rules for regular plurals formed by adding -s, -es, or -ies. It also discusses irregular plurals that are formed in other ways, such as changing the internal vowel or ending of the word. Some nouns are also pluralia tantum, meaning they have the same form for both singular and plural. The document provides many examples for each rule to illustrate how different nouns follow the various patterns for forming their plural forms in English.