Notes on Nouns and Articles

Concrete Nouns: Refer to physically existing people, things, or places detectable by the senses.
- Examples: doctor, dog, river, chair, moon
Abstract Nouns: Refer to non-physical ideas, emotions, and concepts.
- Examples: love, intelligence, justice, freedom, happiness
Proper Nouns: Name a specific person, place, or thing; always begin with a capital letter.
- Examples: Kavindu, Sadeepa, Pepsi, Toyota, Colombo, London, Buddhism, Hinduism
Collective Nouns: Refer to a set or group of people, animals, or things.
- Examples: flock, team, army, bunch

Regular Plural Formation: Add "-s" to most nouns.
- Examples: bottle – bottles, doctor – doctors, river - rivers
Nouns Ending in -ch, -sh, -s, -ss, -o, -x: Add "-es".
- Examples: bench – benches, brush – brushes, kiss - kisses, box – boxes, mango – mangoes, bus - buses
Nouns Ending in -f or -fe: Change "-f" or "-fe" to "-v" and add "-es".
- Examples: wolf – wolves, wife - wives
Nouns with Same Singular and Plural Forms:
- Examples: sheep – sheep, deer – deer, series – series, species - species
Irregular Plural Forms: Some nouns have irregular plural forms that do not follow typical rules.

Countable Nouns: Can be made plural and can be counted.
- Examples: pen – pens, car – cars, man – men, boy - boys
Uncountable Nouns (Mass Nouns): Cannot be made plural and cannot be counted directly.
- Examples: water, oil, dust, paper
Units of Measurement for Mass Nouns: Mass nouns can be quantified using units of measurement.
- Examples: A kilo of sugar, A bottle of milk, A sheet of paper

Nouns are often preceded by articles: a, an (indefinite articles) or the (definite article).
Articles are also called determiners.

Used with singular countable nouns to refer to a thing or an idea for the first time.
- Example: We have a dog and an eagle.
a: Used before a word beginning with a consonant sound.
- Examples: a toy, a book, a house
an: Used before a word beginning with a vowel sound.
- Examples: an operation, an egg, an apple
Exceptions:
- "an" before words starting with a silent 'h': an honor, an hour
- "a" before words that start with a vowel but have a consonant sound: a university, a unicorn

Used with singular and plural, countable and uncountable nouns when both the speaker and the listener already know the thing or idea.
- Example: We have a dog and an eagle. The dog is a puppy and the eagle is old.
Specific Uses:
- Before seas, rivers, hotels, pubs, theaters, museums, and newspapers.
  - Examples: The Observer, The Savoy, The Atlantic
- When there is only one of something.
  - Examples: the sun, the world, the government
- With superlatives.
  - Example: She is the tallest woman in the world.
Omission of Articles (No Article):
- With plural and uncountable nouns when talking in general.
  - Examples: Students are mischievous. I like cheese.
- Before countries, towns, streets, languages, magazines, meals, airports, stations, and mountains.
  - Examples: They live in Nugegoda. She had dinner with her best friend.
- Before some places and with some forms of transport.
  - Examples: at home, in/to bed, by bus, by plane, at/to school/university, at/to work, on foot, by train

Uncountable nouns and countable nouns in plural are preceded by some when a certain quantity or number is implied.
When referring to nouns in a general sense, the article is omitted.
- Examples: Exercise is good for all of us. Water is good for health.
- Give me some water. Give me some bread.
Some is used in affirmative sentences, while any is used in negative and interrogative sentences.
- Affirmative: There is some news.
- Negative: There isn’t any news.
- Interrogative: Is there any news?