EAG01 — Articles & Nouns
📚 Chapter EAG01 · CDS Grammar Level
CDS Level
📌 What This Chapter Covers: Articles (a, an, the) and Nouns are among the most consistently tested topics in CDS English. Together they appear across Spotting Errors, Fill in the Blanks, and Sentence Improvement question types. This chapter merges both topics because article usage is inseparable from noun type — whether a noun is countable or uncountable, proper or common, directly determines which article (if any) it takes.
PART A — ARTICLES
1. The Three Articles — At a Glance
English has three articles. Two are indefinite (a, an) and one is definite (the). The choice between them depends on sound, context, and noun type.
A
Indefinite Article “a”
Before consonant sounds
Used before a word beginning with a consonant sound. Not the letter — the sound. Refers to any one non-specific member of a class.
a booka universitya one-eyed mana Europeana useful tool
AN
Indefinite Article “an”
Before vowel sounds
Used before a word beginning with a vowel sound. Determined entirely by pronunciation, not spelling.
an applean houran honest manan MBAan NDA cadet
THE
Definite Article “the”
Specific / already known
Used when both speaker and listener know which specific thing is meant. Also used with superlatives, unique objects, rivers, ranges, etc.
the sunthe Himalayasthe Gangathe Indian Army
2. “A” vs “An” — The Sound Rule
Core Rule: The choice between “a” and “an” depends entirely on the initial sound of the following word, not its spelling. Vowel sound → “an”. Consonant sound → “a”.
Use “an” — vowel sound
- an hour — ‘h’ is silent → vowel sound
- an honest man — ‘h’ silent → vowel sound
- an heir — silent h → /eə/ vowel
- an MBA — spoken ‘em-bee-ay’ → vowel start
- an X-ray — spoken ‘ex-ray’ → vowel start
- an IAS officer — ‘I’ spoken as vowel
- an NDA cadet — ‘N’ spoken as /en/ vowel
Use “a” — consonant sound
- a university — starts with /j/ (y-sound)
- a European — starts with /j/ (y-sound)
- a one-eyed man — ‘one’ starts with /w/
- a useful tool — ‘useful’ starts with /j/
- a union — starts with /j/ consonant
- a utensil — starts with /j/ consonant
- a historian — ‘h’ is pronounced → consonant
⚠ Exam Trap — Most Common Error: Students write “an university” or “an useful” because they see a vowel letter. But “university” and “useful” begin with a /j/ sound (like “you”) — a consonant sound. Use “a”. Conversely, “hour”, “honest”, “heir” begin with a silent ‘h’ → vowel sound → use “an”.
Q1. Choose the correct article: “She is ___ honest officer who served for ___ decade.”
- (a) a … a
- (b) an … a
- (c) an … an
- (d) a … an
Answer: (b) an … a
“Honest” starts with a silent h → vowel sound → an. “Decade” starts with /d/ consonant sound → a. This is a classic CDS Spotting Errors pattern where students write “a honest” by looking at the letter, not the sound.
Q2. “He was ___ one-man army who had ___ MBA from a reputed university.”
Select the correct pair of articles.
- (a) a … an
- (b) an … a
- (c) a … a
- (d) an … an
Answer: (a) a … an
“One” begins with /w/ consonant sound → a one-man army. “MBA” is read as letters ‘em-bee-ay’ → starts with /em/ vowel → an MBA. Both traps appear in the same sentence — typical CDS style.
3. Uses of “the” — When to Use the Definite Article
3.1 Standard Uses of “the” CORE RULES
3.2 When NOT to use “the” COMMON TRAP
Q. Identify the error: “The Everest is the highest peak in the Himalayas and the Asia.”
Errors: “The Everest” → Wrong. Single peaks never take “the”. Write Mount Everest. “the Asia” → Wrong. Continents never take “the”. Write Asia.
Correct sentence: “Mount Everest is the highest peak in the Himalayas and Asia.”
Note: “the Himalayas” is correct — mountain range always takes “the”.
Q. “The President Modi addressed the nation via the radio.” — Spot the error(s).
Error: “The President Modi” → When a title is directly followed by a proper name, no article is used. Write President Modi. But “the radio” is correct (specific medium/device).
Rule to remember: Title + Name = No article. Title without name = “the” (e.g., The President addressed the nation).
Q3. (CDS 2024-I style) Choose the correct sentence:
- (a) The Ganga is the holiest river of the India.
- (b) Ganga is holiest river of India.
- (c) The Ganga is the holiest river of India.
- (d) The Ganga is holiest river of India.
Answer: (c)
Rivers take “the” → The Ganga ✓. Superlatives take “the” → the holiest ✓. Country names (singular) take no article → India not “the India” ✓. Option (b) misses “the” with river and superlative. Option (d) misses “the” before superlative.
Q4. (CDS 2023-II style) Fill in the blank: “___ more you practise, ___ better you perform.”
- (a) The … the
- (b) A … a
- (c) The … a
- (d) No article needed
Answer: (a) The … the
This is the parallel comparative structure: The more … the better. Both halves of the structure must have “the”. If either “the” is dropped, it is a grammatical error. Commonly tested in Spotting Errors — the second “the” is usually the one omitted in wrong options.
4. Uses of “a / an” — Indefinite Articles
Core Uses of “a / an”
- First mention of a countable singular noun: I saw a soldier.
- Equivalent to “one”: Give me a pen
- Any member of a class: A dog is a faithful animal.
- Profession / identity: He is a doctor. She is an engineer.
- Exclamations: What a beautiful day! What an idea!
- Rate / ratio: twice a day, ₹50 a kg, 60 km an hour
Special & Tricky Uses
- After “what” and “such”: What a pity! Such an honour!
- After “half”: half a kilo, half an hour
- Name used as common noun: He is a Ratan Tata of business.
- a few vs few / a little vs little: a few = some; few = almost none
- Before certain numbers: a hundred, a thousand, a million
- Fixed expressions: make a noise, take a seat, have a rest
5. Zero Article — When No Article is Used
Sometimes no article at all is used. This is called the “zero article”. Knowing when to use no article is just as important as knowing which one to use.
PL
Plural & Uncountable Nouns (general)
General statements about a class of things.
Soldiers are brave.Water is essential.Gold is precious.
Names of people, singular countries, cities, languages, subjects.
India, Delhi, HindiMount EverestAsia, Mathematics
IN
Institutions by Purpose
When visiting a place for its intended purpose, no article. When visiting as a physical building, “the” is used.
go to school/hospitalgo to the school (building)
AB
Abstract Nouns (general)
Abstract nouns used generally take no article. When specific, add “the”.
Honesty is the best policy.The courage he showed was remarkable.
💡 Institutions Memory Trick — Purpose vs Place:
Purpose (no article): go to school (as student) | in hospital (as patient) | in prison (as prisoner) | at sea (on voyage)
Physical location (use “the”): go to the school (as visitor) | visit the hospital | inspect the prison
6. Tricky Contexts — The Most Tested Patterns
6.1 Mountain Peaks vs Mountain Ranges VERY COMMON
Rule
Single peak → no article | Mountain range → the
✓ We trekked to Mount Everest. ✓ The soldiers crossed the Himalayas.
✗ We trekked to the Mount Everest. ✗ Soldiers crossed Himalayas.
6.2 “a few / few” and “a little / little” FILL IN THE BLANK
With “a” → Positive meaning (some)
- a few = some, enough → countable: I have a few friends.
- a little = some, enough → uncountable: There is a little water.
Without “a” → Negative meaning (barely any)
- few = almost none → countable: Few soldiers survived.
- little = almost none → uncountable: There is little hope.
6.3 Parallel Comparative — “The more … the better” SPOTTING ERRORS
Rule — Both halves must have “the”
✓ The harder you train, the better you perform.
✗ The harder you train, better you perform. (missing “the” in second part)
6.4 Special Article Table — Proper Nouns MUST MEMORISE
7. Grammar Rules Tested in CDS — Articles
⚠ Rule 1 — Title + Proper Name: No Article
✓ President Murmu, Captain Sharma, Prime Minister Modi | ✗ the President Murmu
But: “The President of India gave a speech” (title without name → “the” is correct)
⚠ Rule 2 — Same Noun, Different Article, Different Meaning
He went to prison (as prisoner) vs He went to the prison (as visitor)
She is in bed (sleeping) vs She is in the bed (specific bed)
At sea (on voyage) vs In the sea (in the water itself)
💡 Memory Hook — RSUM: Use “the” when the noun is Referred to again, is Superlative, is Unique, or is a named body of water. For everything else, default to context.
✅ Rule 3 — Ordinals and Superlatives always need “the”
✓ She was the first woman to climb that peak. | ✗ She was first woman to climb.
✓ He was the best cadet in his batch. | ✗ He was best cadet in his batch.
Q5. Find the error: “(A) She plays / (B) the cricket / (C) every evening / (D) No error”
Answer: (B) Sports and games do not take any article. Write: She plays cricket every evening. “The cricket” would mean a specific cricket match, which changes the meaning and is not standard.
Q6. Find the error: “(A) He is / (B) a unique person / (C) who plays the piano / (D) No error”
Answer: (A)/(B) “Unique” begins with /j/ (y-sound) → it is a consonant sound → use “a”. “a unique person” is already correct in the stem. “plays the piano” is correct (musical instruments when played take “the”). Answer is (D) No error if the stem itself is correct. This type tests reading under exam pressure.
Q7. (CDS 2025-I pattern) Fill in the blank: “___ Himalayas lie to the north of India, and ___ Mount Everest is their highest point.”
- (a) The … The
- (b) The … no article
- (c) No article … The
- (d) No article … no article
Answer: (b) Mountain ranges take “the” → The Himalayas. Single mountain peaks take no article → Mount Everest (not “The Mount Everest”). This contrast is among the most repeated patterns in CDS English over the past three years.
PART B — NOUNS
8. What is a Noun? — Five Types
A noun names a person, place, thing, quality, or idea. Noun type determines article usage, verb agreement, and pluralisation — making it foundational for all grammar questions.
PR
Proper Noun
Names a specific individual
Always capitalised. Refers to a unique entity — not a class. Most proper nouns take no article.
ArjunDelhiIndiaUPSC, NDA
CM
Common Noun
Names any member of a class
General members of a group. Written in lowercase. Takes articles depending on context.
soldiercityriverdog, book, officer
CO
Collective Noun
Names a group as one unit
A collection of people, animals, or things treated as a single unit. Verb agreement is exam-tested.
armyfleetcommitteejury, crew, crowd
AB
Abstract Noun
Names a quality, idea, or state
Cannot be seen or touched. Formed from adjectives/verbs using suffixes. Usually uncountable.
couragehonestyfreedomwisdom, loyalty
MA
Material Noun
Names a material or substance
Raw materials. Uncountable in standard usage — cannot be pluralised.
goldwatersteeliron, cotton, wood
9. Countable vs Uncountable Nouns ▲ Most Tested
Key Distinction: Countable nouns can be counted and have both singular and plural forms (one soldier, two soldiers). Uncountable nouns cannot be directly counted (water, advice, furniture) and always take a singular verb. The biggest category of CDS errors comes from treating uncountable nouns as countable.
Uncountable Nouns — Always Singular
- advice — He gave me good advice. (not “advices”)
- information — The information is correct.
- furniture — The furniture was expensive.
- luggage / baggage — His luggage was heavy.
- news — The news is good. (always singular)
- scenery, machinery, progress — singular verbs
- knowledge, poetry, research — singular verbs
Nouns That Look Plural but Take Singular Verbs
- mathematics / physics / economics — singular
- politics / athletics / news — singular
- innings / series / means — singular
- species / aircraft / offspring — singular or context
💡 Uncountable Cluster to Memorise: Advice, Information, Knowledge, Furniture, Luggage, Baggage, Machinery, Scenery, Poetry, Progress, News, Work, Traffic, Research, Equipment — None can be pluralised or preceded by a/an in standard usage.
Q8. Find the error: “(A) She gave me / (B) an advice / (C) that helped me a lot / (D) No error”
Answer: (B) “Advice” is an uncountable noun and cannot take “an” or be pluralised. Correct: She gave me advice that helped me a lot. You can say “a piece of advice” but never “an advice”. This error has appeared across multiple CDS exams.
Q9. (CDS 2024-II pattern) Find the error: “(A) The news / (B) about the operation / (C) are very encouraging / (D) No error”
Answer: (C) “News” is always singular → use “is”, not “are”. Correct: The news about the operation is very encouraging. “News” ends in ‘s’ and looks plural, but it is a singular uncountable noun.
10. Plural Forms — Rules & Irregulars
10.1 Standard Pluralisation Rules FILL IN THE BLANK
10.2 Irregular Plurals VERY COMMON IN CDS
Q. Identify the error: “The criterias for selection to the NDA are strict.”
Error: “criterias” → Wrong. “Criteria” is already plural (singular: criterion). You cannot add ‘s’ to an already-plural Latin-derived word.
Correct: The criteria for selection to the NDA are strict.
Same rule applies: phenomenon → phenomena (not “phenomenas”); datum → data (not “datas”).
Q. Identify the error: “He invited all his mother-in-laws to the ceremony.”
Error: “mother-in-laws” → Wrong. In compound nouns, the head noun (the main noun) is pluralised, not the last word.
Correct: mothers-in-law
Same rule: commanders-in-chief, passers-by, courts martial. The modifier (“in-law”) never takes the plural ‘s’.
11. Collective Nouns — Verb Agreement
Rule: A collective noun takes a singular verb when the group acts as one unit, and a plural verb when members act individually. In CDS, the singular verb is almost always the expected answer unless the sentence explicitly describes individual actions.
Collective Nouns — Military & Defence
- army — The army was deployed.
- fleet — A fleet of ships was dispatched.
- regiment — The regiment marched forward.
- squadron — The squadron took off at dawn.
- platoon / brigade / battalion — singular verbs
- crew — The crew was well-trained.
Collective Nouns — Animals & People
- committee — The committee has decided.
- jury — The jury was unanimous.
- flock of birds/sheep; herd of cattle
- pride of lions; pack of wolves
- school of fish; gaggle of geese
- swarm of bees; murder of crows
Q10. Find the error: “(A) The committee / (B) have decided / (C) to approve the proposal / (D) No error”
Answer: (B) “The committee” acts as a single unit here → use singular verb “has decided”, not “have decided”. The committee has decided to approve the proposal.
Note: If the sentence said “The committee are divided in their opinions”, the plural “are” would be acceptable (individual members acting separately).
12. Gender of Nouns Sentence Improvement
13. Possessive Case — Apostrophe Rules Spotting Errors
Apostrophe Rules
- Singular noun: add ‘s — the soldier’s rifle
- Plural ending in -s: apostrophe only — the soldiers’ rifles
- Irregular plural (not -s): add ‘s — the children’s school
- Compound noun: add ‘s to last word — my father-in-law’s house
- Joint possession: ‘s to last name only — Ram and Shyam’s house
- Separate possession: ‘s to each — Ram’s and Shyam’s houses
Inanimate Objects — Use “of” instead
- ✓ the leg of the table (not “the table’s leg”)
- ✓ the cover of the book
- Exceptions (apostrophe accepted):
- Time expressions: a day’s work, an hour’s delay, today’s news
- Personification: nature’s beauty, fortune’s favour
14. Key Noun Rules Tested in CDS
⚠ Rule 1 — “News” is ALWAYS singular:
✓ The news is good. | ✗ The news are good.
✓ No news is good news. | ✗ No news are good news.
⚠ Rule 2 — Uncountable nouns never take a/an or plural -s:
✓ She gave me good advice. | ✗ She gave me an advice / advices.
✓ He has furniture in his room. | ✗ He has furnitures.
✓ Please share the information. | ✗ Please share an information / informations.
⚠ Rule 3 — “Criteria”, “phenomena”, “data” are PLURAL:
✓ The criteria are clear. | ✗ The criteria is clear. (criteria = plural of criterion)
✓ These phenomena were observed. | ✗ These phenomena was observed.
✅ Rule 4 — Compound Noun Plurals:
The head/main noun in a compound gets pluralised, never the modifier:
✓ mother-in-law → mothers-in-law | ✗ mother-in-laws
✓ commander-in-chief → commanders-in-chief | ✓ passer-by → passers-by
15. Abstract Noun Formation & Confused Noun Pairs
Abstract Noun Suffixes
- Adj + -ness: brave→bravery; kind→kindness
- Adj + -ity: able→ability; sincere→sincerity
- Verb + -tion/-sion: act→action; decide→decision
- Verb + -ment: achieve→achievement; govern→government
- Noun + -hood: child→childhood; brother→brotherhood
- Noun + -ship: friend→friendship; leader→leadership
Commonly Confused Noun Pairs
- advice (noun) vs advise (verb)
- practice (noun) vs practise (verb)
- effect (noun) vs affect (verb)
- principal (main/chief) vs principle (rule/value)
- stationary (not moving) vs stationery (writing materials)
- complement (completes) vs compliment (praise)
- counsel (advice/adviser) vs council (governing body)
Q11. (CDS 2024-I pattern) Find the error: “(A) The officer / (B) gave a very good / (C) advise to the cadets / (D) No error”
Answer: (C) “Advise” is a verb; the noun is “advice”. Correct: gave very good advice to the cadets. Also note: “a … advice” would be wrong since “advice” is uncountable (no “a”). Say “gave good advice” not “gave a good advice”.
Q12. Sentence Improvement: “The committee have decided to postpone the recruitment.”
- (a) has been decided
- (b) has decided
- (c) decided
- (d) No improvement needed
Answer: (b) has decided
The committee acting as a single unit takes a singular verb. Replace “have decided” with “has decided”. This is one of the most frequently repeated Sentence Improvement patterns in CDS English over 2023–2025.
Q. Identify ALL errors: “The furnitures in the hall was moved to a new room by the staffs.”
Two errors:
1. “furnitures” → “furniture” is uncountable; no plural form. Write furniture.
2. “staffs” → “staff” is a collective noun used without plural -s in standard usage. Write staff.
Verb: “was moved” is correct (furniture = uncountable = singular verb).
Corrected sentence: The furniture in the hall was moved to a new room by the staff.
Q. “An unique soldier with a NDA pedigree joined the corps.” — Spot both article errors.
Error 1: “An unique” → “unique” starts with /j/ (y-sound) → consonant sound → use “a unique”.
Error 2: “a NDA” → “NDA” is read as ‘en-dee-ay’ → starts with /en/ vowel sound → use “an NDA”.
Corrected: A unique soldier with an NDA pedigree joined the corps.
📋 Quick Reference — Articles & Nouns
🔊 a vs an Rule
- Based on sound, not spelling
- an hour, an honest, an heir (silent h)
- a university, a useful, a union (y-sound)
- an MBA, an IAS, an NDA (vowel letter names)
- a one-eyed (w-sound), a European (y-sound)
🌍 Always “the”
- Rivers, mountain ranges, deserts, seas
- Superlatives & ordinals (the best, the first)
- Newspapers, sacred books
- Musical instruments (play the guitar)
- Plural / union country names (the USA, the UK)
🚫 Never Any Article
- Single peaks (Mount Everest)
- Cities, singular countries, continents
- Languages, subjects, sports, meals
- Title + proper name (President Modi)
- Abstract nouns in general sense
⚠ Always Singular Verbs
- news, mathematics, physics, economics
- politics, athletics, innings, series
- furniture, advice, luggage, information
- means, species, aircraft, offspring
🚫 Can’t Pluralise
- advice, information, knowledge
- furniture, luggage, baggage, machinery
- scenery, poetry, progress, news
- research, equipment, traffic, work
🔄 Irregular Plurals
- man→men; woman→women; child→children
- criterion→criteria; phenomenon→phenomena
- datum→data; medium→media
- sheep, deer, fish → same form
🎓 Purpose vs Location
- go to school (as student)
- go to the school (as visitor)
- in hospital (as patient)
- at sea (on voyage)
- in prison (as prisoner)
📄 Compound Plural Rule
- mothers-in-law (NOT mother-in-laws)
- commanders-in-chief
- passers-by
- courts martial
- Pluralise the HEAD noun
⚠ Top Exam Traps
- “an university” is WRONG (“a university”)
- “the Mount Everest” is WRONG
- “advices” is WRONG (advice = uncountable)
- “the criteria is” is WRONG (“criteria are”)
- “the more … better” is WRONG (the more … the better)
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