Definite and Indefinite articles (A, An, The)

Let’s look at each kind of article a little more closely.

Indefinite Articles: a and an

“A” and “an” signal that the noun modified is indefinite, referring to any member of a group. For example:

“My daughter really wants a dog for Christmas.” This refers to any dog. We don’t know which dog because we haven’t found the dog yet.

“Somebody call a policeman!” This refers to any policeman. We don’t need a specific policeman; we need any policeman who is available.

“When I was at the zoo, I saw an elephant!” Here, we’re talking about a single, non-specific thing, in this case, an elephant. There are probably several elephants at the zoo, but there’s only one we’re talking about here.

Remember, using “a” or “an” depends on the sound that begins the next word. So…

“A” + singular noun beginning with a consonant: a boy; a car; a bike; a zoo; a dog

“An” + singular noun beginning with a vowel: an elephant; an egg; an apple; an idiot; an orphan

“A” + singular noun beginning with a consonant sound: a user (sounds like ‘yoo-zer,’ i.e. begins with a consonant ‘y’ sound, so ‘a’ is used); a university; a unicycle

“an” + nouns starting with silent “h”: an hour

“a” + nouns starting with a pronounced “h”: a horse

In some cases where “h” is pronounced, such as “historical,” you can use an. However, a is more commonly used and preferred.

A historical event is worth recording.

Remember that these rules also apply when you use acronyms:

Introductory Composition at Purdue (ICaP) handles first-year writing at the University. Therefore, an ICaP memo generally discusses issues concerning English 106 instructors.

Another case where this rule applies is when acronyms or initialisms start with consonant letters but have vowel sounds:

An MSDS (material safety data sheet) was used to record the data. An SPCC plan (Spill Prevention Control and Countermeasures plan) will help us prepare for the worst.

If the noun is modified by an adjective, the choice between “a” and “an” depends on the initial sound of the adjective that immediately follows the article:

a broken egg

an unusual problem

a European country (sounds like ‘yer-o-pi-an,’ i.e. begins with consonant ‘y’ sound)

Remember, too, that in English, the indefinite articles are used to indicate membership in a group:

I am a teacher. (I am a member of a large group known as teachers.)

Brian is an Irishman. (Brian is a member of the people known as Irish.)

Seiko is a practicing Buddhist. (Seiko is a member of the group of people known as Buddhists.)

Definite Article: the

The definite article is used before singular and plural nouns when the noun is specific or particular. The signals that the noun is definite, that it refers to a particular member of a group. For example:

“The dog that bit me ran away.” Here, we’re talking about a specific dog, the dog that bit me.

“I was happy to see the policeman who saved my cat!” Here, we’re talking about a particular policeman. Even if we don’t know the policeman’s name, it’s still a particular policeman because it is the one who saved the cat.

“I saw the elephant at the zoo.” Here, we’re talking about a specific noun. Probably there is only one elephant at the zoo.

Count and Noncount Nouns

The can be used with noncount nouns, or the article can be omitted entirely.

“I love to sail over the water” (some specific body of water) or “I love to sail over water” (any water).

“He spilled the milk all over the floor” (some specific milk, perhaps the milk you bought earlier that day) or “He spilled milk all over the floor” (any milk).

“A/an” can be used only with count nouns.

“I need a bottle of water.”

“I need a new glass of milk.”

Most of the time, you can’t say, “She wants a water,” unless you’re implying, say, a bottle of water.