In this article, you will explore the key takeaways and definitions of ‘a’ vs. ‘an’, discover 13 rules for using indefinite articles, and find examples of each in sentences. By the end of this article, you will be confident in choosing whether to use ‘a’ or ‘an’ in your spoken and written English. (The words an and a are known as articles.) The sound of a word's first letter determines whether to use an or a. If the word starts with a vowel sound, you should use an. If it starts with a consonant sound, you should use a. For example: Buy a house in an hour. An unknown goblin killed a unicorn. In this quick guide, I’ll show you exactly when to use “a” and when to use “an” (with easy examples you’ll remember forever). So, if you want to write with confidence and sound fluent, let’s finally master “an or a” once and for all! 🚀. The rule that many people vaguely remember is that one uses 'a' if the word that follows it begins with a consonant, and one uses 'an' if the following word begins with a vowel. Basically, an article is an adjective. Like adjectives, articles modify nouns. English has two articles: the and a/an. The is used to refer to specific or particular nouns; a/an is used to modify non-specific or non-particular nouns. We call the the definite article and a/an the indefinite article. the = definite article. a/an = indefinite article. In this article, we explain the difference between them. An is a determiner that means the indefinite article before nouns with a vowel sound. And is a conjunction that means expressing two elements to be taken together or besides each other. Let's take a closer look at each word. An is an indefinite article. Use “a” before words that begin with a consonant sound. It is used when referring to a non-specific item or when mentioning something for the first time. Examples: I saw a dog in the park. She wants to buy a car. Use “an” before words that begin with a vowel sound (a, e, i, o, u). Writers sometimes confuse the use of the articles a and an. We were all taught that a precedes a word starting with a consonant and that an precedes a word starting with a vowel (a, e, i, o, u, and sometimes y). Here’s the secret to making the rule work: The rule applies to the sound of the letter beginning the word, not just the letter itself. They are a type of determiner and they go before a noun. A/an before a noun shows that what is referred to is not already known to the speaker, listener, writer and/or reader (it is the indefinite article): Do you have a car? Do you live in a house? No, actually, I live in an apartment. 'A' is used before words starting with a consonant sound, even if the first letter is a vowel. 'An' is used before words starting with a vowel sound, even if the first letter is a consonant. 'And' is a conjunction used to join words or phrases, serving a different purpose than 'a' or 'an'.