This document provides a lesson on countable and uncountable nouns in English grammar. It begins by explaining the key differences between countable and uncountable nouns, such as whether they can be counted or used with numbers. It then discusses rules for using singular and plural forms correctly. The lesson includes examples of nouns that can be either countable or uncountable depending on the meaning. It concludes with exercises for students to practice identifying countable and uncountable nouns.