Articles are determiners that specify the definiteness of a noun. English has two types of articles: definite ("the") and indefinite ("a"/"an"). These small but powerful words fundamentally affect noun reference and meaning.
1. When referring to something identifiable to both speaker and listener.
Examples: Pass the salt (specific salt shaker on the table)
2. Unique Entities
With things that are one-of-a-kind
Examples: The sun rises in the east.
3. Previously Mentioned Items
Examples: I saw a cat. The cat was black.
4. Superlatives & Ordinals
Examples:
She's the tallest student.
Read the first chapter.
5. Specific Groups
Examples: The elderly need more support.
1. With general plural / non-count nouns:
Examples: Cats are independent.
2. Most proper nouns:
Examples: She lives in Paris.
3. Abstract concepts:
Examples: Love is beautiful.
1. First Mention
Introducing new, non-specific information
Examples: I saw a dog in a park.
2. General Reference
Referring to any member of a category
Examples: She wants an apple. (any apple)
Professions / Identities
Examples:
He's a doctor.
She became an American citizen.
Quantitative Sense (=one)
Examples: I'll be there in an hour.
"A" is used before words that begin with a consonant sound.
Examples: a book, a car
"An" is used before words that begin with a vowel sound (a, e, i, o, u).
Examples: an apple, an egg
1: Based on Sound, Not Spelling
The choice between "a" and "an" depends on the sound of the following word, not just the first letter.
Examples:
a university → “University" sounds like yoo-ni-ver-si-ty (starts with a 'y' sound, a consonant).
a European → "European" sounds like yoo-ro-pe-an (consonant 'y' sound).
an hour → "Hour" sounds like our (silent 'h').
Rule 2: Before Singular Countable Nouns
"A" and "an" are used only with singular, countable nouns when introducing something general.
Examples: I saw a dog.
Acronyms and Abbreviations
The choice depends on the pronunciation of the first letter.
Examples:
An FBI agent (because "F" is pronounced eff).
A NATO member (because "N" is pronounced en).
A UFO (sounds like yoo-fo).
1. Geographical Names
With "The"
Examples: Mountain ranges (the Alps), Oceans (the Pacific), Countries (the United States)
Without "The"
Examples: Most countries (France), Cities (Paris), Lakes (Lake Superior)
2. Institutions & Facilities
With "The"
Examples: Go to the hospital.(US)
Without "The"
Examples: Go to hospital.(UK - as concept)
3. Musical Instruments
Examples: She plays the piano. (general) But: He bought a piano. (specific)
4. Time Expressions
Examples: in the morning, once a week
5. Fixed Expressions
Examples:
All of a sudden, it rained.
He’s the best.