This document summarizes the difference between countable and uncountable nouns. Countable nouns can be singular or plural and refer to things that can be counted. Uncountable nouns only have one form and refer to materials, substances or abstract concepts that cannot be counted directly. Examples of countable nouns include apple, banana, and pineapple. Examples of uncountable nouns include rice, bread, and milk. The document provides rules for making countable nouns plural and includes exercises to practice using countable and uncountable nouns correctly.