This document provides generalizations for forming plural nouns in English. It notes that most singular nouns form the plural by adding -s. However, nouns ending in certain letters like s, x, z, sh, ch form the plural by adding -es. Nouns ending in a consonant and y change the y to i and add -es, while those ending in a vowel and y just add -s. There are also irregular plural forms that must be memorized. The document includes examples to illustrate each rule.