This document outlines the basic rules for forming plurals in English. It discusses that singular nouns refer to one thing, while plural nouns refer to two or more things. The four main rules covered are: 1) add an "s" to most nouns, 2) add "es" if a noun ends in sh, ch, x, s or z, 3) change y to ies if a noun ends in y, and 4) change f, fe, or ff to ves. There are also irregular nouns that have unique plural forms that must be memorized.