This document discusses countable and uncountable nouns. Countable nouns refer to things that can be counted using numbers and have both a singular and plural form. Uncountable nouns are for things that cannot be counted with numbers, such as abstract ideas, qualities, or physical objects that are too small or amorphous to count, like liquids, powders and gases. Examples are given of countable nouns like "shoe" and "books" and uncountable nouns like "rice", "sugar", and "water".