The document discusses plural nouns in English. It explains that plural nouns refer to more than one of an object or person. There are two main rules for making nouns plural - adding 's' to most nouns, and adding 'es' to nouns ending in s, sh, ch, x or z. Examples are given such as adding 's' to make apple into apples and adding 'es' to change brush into brushes. Plural nouns are important for proper grammar.