This document discusses plural nouns in English. It defines singular and plural, and notes that some nouns form their plural by changing the final letter (e.g. man to men) while others just add -s (e.g. key to keys). There are also exceptions like sheep/deer that don't change form. Special cases covered include nouns ending in consonant+y, vowel+o, -sh/-ch/-x/-z. Irregular plurals like wolf/wolves and an exercise are provided to help learn forming plurals.