Countable nouns are nouns that can be counted and have both singular and plural forms. Examples of countable nouns include "pen", "teacher", "desk", "apple" and "car". You can count these nouns, for example, "one pen", "two teachers", "three desks", "four apples" and "five cars". Countable nouns are also known as "count nouns". Countable nouns can be used in both singular and plural forms. For example, "book" is a singular countable noun, while "books" is its plural form. This book is a collection of short stories. These books are all about different cultures. The indefinite articles a/an can be used with countable nouns in the singular form. The choice between "a" and "an" depends on the sound of the first letter in the word that follows; we use "a" before words that start with consonant sounds, and "an" before wo...