This document discusses countable and uncountable nouns. Countable nouns can be pluralized and take quantifiers like "a" or "an", while uncountable nouns only have a singular form and refer to mass substances. Uncountable nouns can become countable using partitives like "a glass of water". The document provides examples of countable vs uncountable nouns and explains how to use quantifiers like "some", "any", "a", and "an" with both types of nouns. It also covers using "how much" with uncountable nouns and "how many" with countable nouns.