Word Formation, Roots, Prefixes and Suffixes

Word Formation, Roots, Prefixes & Suffixes

Word formation is the process by which new words are created from existing words, roots, prefixes, and suffixes.

A strong understanding of word formation helps students to :

• • understand unfamiliar vocabulary
  • identify meanings of difficult words
  • improve spelling
  • distinguish parts of speech
  • solve synonym and antonym questions
  • answer fill-in-the-blank questions
  • improve sentence correction and word replacement
  • build vocabulary systematically instead of memorising every word separately

Consider the word act

From this one base, several words can be formed. For eg. :

• • act
  • action
  • active
  • actively
  • activate
  • activity
  • actor
  • actress
  • inactive
  • interaction
  • reaction

Similarly, consider another word nation. It can produce:

• • national
  • nationality
  • nationalise
  • nationalism
  • nationalist
  • international
  • multinational

Understanding how such words are constructed makes vocabulary much easier.

Root Words

A root word is the basic element of a word that carries its central meaning. Other elements may be added before or after the root.

Example:

• unhelpful

This may be analysed as: un + help + ful

• • un- = not
  • help = root/base word
  • -ful = full of/having

Therefore: unhelpful = not helpful

Root, Prefix and Suffix

• Consider the word disagreement : dis + agree + ment
• • dis- = negative/opposite
  • agree = root/base
  • -ment = forms a noun

Meaning: disagreement = lack of agreement

• Another word carelessness : care + less + ness
  • care = root
  • -less = without
  • -ness = state or quality

Meaning: carelessness = the state of being careless

Root vs Base Word

A base word can often stand independently as a complete English word.

Examples:

• • help
  • use
  • care
  • work
  • agree

A root may or may not be able to stand alone.

Example:

spect relates to looking, but spect is not normally used as an independent English word.

It appears in:

• inspect
• respect
• spectator
• spectacle
• perspective

For competitive examinations, the terms root and base word are sometimes used loosely, but understanding the distinction is useful.

Common Root Words

How Root Words Help

Suppose you encounter the word : incredible

If you know:

• • in- = not
  • cred = believe
  • -ible = capable of

you can infer: incredible = difficult or impossible to believe

Similarly: transport

• • trans- = across
  • port = carry

Therefore:

transport = carry from one place to another

Important Root-Based Word Groups

spect = look

• • inspect = look into carefully
  • spectator = person who watches
  • spectacle = something seen
  • respect = regard
  • prospect = view or possibility ahead
  • retrospect = looking back

scrib/script = write

• • describe
  • prescribe
  • subscribe
  • manuscript
  • inscription
  • transcript

dict = say

• • dictate
  • diction
  • dictionary
  • predict
  • contradict
  • verdict

port = carry

• • transport
  • import
  • export
  • portable
  • porter

tract = pull/draw

• • attract
  • distract
  • contract
  • extract
  • retract

ject = throw

• • inject
  • eject
  • reject
  • project
  • object
  • interject

cred = believe

• • credible
  • incredible
  • credit
  • credentials
  • creed

Root Analysis in Competitive Exams

A root can help in questions involving unfamiliar words.

Example: audible

If aud = hear, then: audible = capable of being heard.

Similarly:

invisible : in + vis + ible

• • in = not
  • vis = see
  • ible = capable of

Meaning : not capable of being seen

Greek Roots

A large portion of scientific, technical, medical, and academic English comes from Greek roots.

Knowledge of Greek roots is especially useful in questions involving:

• • science vocabulary
  • medicine
  • geography
  • politics
  • philosophy
  • psychology
  • technology

Anthrop

Meaning: human/man

Examples:

anthropology = study of humans

anthropologist = person who studies humans and cultures

anthropogenic = caused by human activity

Auto

Meaning: self

Examples:

autobiography = story of one’s own life

automatic = acting by itself

autonomous = self-governing

Bio

Meaning: life

Examples:

biology = study of life

biography = written account of a person’s life

biodiversity = variety of living organisms

biodegradable = capable of being broken down biologically

Chron

Meaning: time

Examples:

chronology = arrangement according to time

chronological = arranged by time

chronic = continuing for a long time

Demo

Meaning: people

Examples:

democracy = government by the people

demography = study of population

demographic = relating to population

Geo

Meaning: earth

Examples:

geography = study of the Earth and spatial relationships

geology = study of Earth’s physical structure

geothermal = relating to heat from within the Earth

geopolitics = relationship between geography and politics

Graph/Gram

Meaning: write, record, representation

Examples:

autograph = one’s own signature

photograph = image recorded using light

telegram = message sent over distance

diagram = visual representation

Hydro

Meaning: water

Examples:

hydrology = study of water

hydroelectric = generating electricity from water

hydrosphere = Earth’s water component

Logos/Logy

Meaning: study, word, reasoning

Examples:

biology = study of life

geology = study of Earth

psychology = study of mind and behaviour

sociology = study of society

Macro

Meaning: large

Examples:

macroeconomics

macroscopic

macrostructure

Micro

Meaning: small

Examples:

microscope

microbiology

microorganism

microeconomics

Mono

Meaning: one

Examples:

monologue = speech by one person

monopoly = control by one seller/entity

monochrome = having one colour

Morph

Meaning: form or shape

Examples:

morphology = study of form

geomorphology = study of landforms

metamorphosis = transformation of form

Path

Meaning: feeling or disease

Examples:

sympathy

empathy

pathology = study of disease

Phil

Meaning: love

Examples:

philosophy = traditionally associated with love of wisdom

philanthropy = love of humanity expressed through charitable action

bibliophile = person who loves books

Phobia

Meaning: fear

Examples:

claustrophobia = fear of enclosed spaces

hydrophobia = fear of water; also historically associated with rabies symptoms

xenophobia = fear or hostility towards foreigners or outsiders

Photo

Meaning: light

Examples:

photograph

photosynthesis

photogenic

Poly

Meaning: many

Examples:

polygon = many-sided figure

polytheism = belief in many gods

polyglot = person who knows many languages

Psych

Meaning: mind

Examples:

psychology

psychological

psychiatry

Scope

Meaning: see/view

Examples:

microscope

telescope

periscope

Tele

Meaning: far/distant

Examples:

telephone

television

telecommunication

telescope

Therm

Meaning: heat

Examples:

thermal

thermometer

geothermal

thermodynamics

Greek Roots Revision Table

Latin Roots

A large number of common English words come from Latin roots.

Latin roots are particularly useful for understanding:

• • administrative terms
  • legal vocabulary
  • academic vocabulary
  • formal English
  • everyday English vocabulary

Bene

Meaning: good/well

Examples:

benefit = advantage

beneficial = producing good results

benevolent = kind and generous

Mal

Meaning: bad

Examples:

malfunction = function badly

malnutrition = poor nutrition

malpractice = improper professional conduct

Aud

Meaning: hear

Examples:

audible

audience

auditory

Cred

Meaning: believe

Examples:

credible

incredible

credibility

credit

Dict

Meaning: say/speak

Examples:

dictate

predict

contradict

verdict

Duc/Duct

Meaning: lead

Examples:

conduct

introduce

educate historically derives through the idea of leading out

aqueduct

Fac/Fact/Fect

Meaning: make/do

Examples:

factory

manufacture

effect

perfect

Fer

Meaning: carry/bear

Examples:

transfer

refer

confer

offer

Fin

Meaning: end/boundary

Examples:

final

finish

finite

define

Flex/Flect

Meaning: bend

Examples:

flexible

reflect

deflect

Form

Meaning: shape

Examples:

form

reform

transform

formation

Grad/Gress

Meaning: step/go

Examples:

grade

graduate

progress

regress

congress

Ject

Meaning: throw

Examples:

reject

inject

eject

project

Jur/Jus

Meaning: law/right

Examples:

jury

jurisdiction

justice

justify

Manu

Meaning: hand

Examples:

manual

manuscript

manufacture

Mit/Miss

Meaning: send

Examples:

submit

transmit

dismiss

mission

permission

Mort

Meaning: death

Examples:

mortal

mortality

immortal

Ped

Meaning: foot

Examples:

pedestrian

pedal

pedicure

Do not confuse with Greek ped/pedag relating to children or education in words such as pedagogy.

Port

Meaning: carry

Examples:

portable

transport

import

export

Rupt

Meaning: break

Examples:

rupture

interrupt

corrupt

disrupt

Scrib/Script

Meaning: write

Examples:

scribe

describe

script

manuscript

inscription

Sect/Sec

Meaning: cut

Examples:

section

dissect

bisect

Sent/Sens

Meaning: feel

Examples:

sensation

sensitive

sentiment

Spect

Meaning: look

Examples:

inspect

spectator

respect

prospect

Struct

Meaning: build

Examples:

construct

structure

infrastructure

destruction

Terr

Meaning: earth/land

Examples:

territory

terrestrial

terrain

Mediterranean

Tract

Meaning: pull/draw

Examples:

attract

contract

extract

distract

Vid/Vis

Meaning: see

Examples:

video

vision

visible

visual

Voc/Vok

Meaning: call/voice

Examples:

vocal

vocation

invoke

provoke

Latin Roots Revision Table

Prefixes

A prefix is a group of letters added before a root or base word to modify its meaning.

Example: happy → unhappy  Here: un- means not.

write → rewrite. Here: re- means again.

A prefix usually changes the meaning of a word, though it may not always change its grammatical category.

Negative Prefixes

Un-

Meaning: not, opposite of

Examples:

• • unhappy
  • unfair
  • uncertain
  • unable
  • unusual

In-

Meaning: not

Examples:

• • incorrect
  • inactive
  • incomplete
  • indirect

The form changes depending on the following sound.

Im-

Used especially before m, p, b sounds.

Examples:

• • impossible
  • improper
  • immature
  • imbalance

Il-

Often before l

Examples:

• • illegal
  • illogical
  • illegible

Ir-

Often before r

Examples:

• • irregular
  • irresponsible
  • irrelevant

Dis-

Meaning:

• • not
  • opposite
  • reverse

Examples:

• • disagree
  • dishonest
  • dislike
  • disconnect
  • disapprove

Non-

Meaning: not

Examples:

• • non-verbal
  • non-payment
  • non-existent
  • non-violent

Prefixes Showing Repetition or Return

Re-

Meaning: again or back

Examples:

• • rewrite
  • reconsider
  • rebuild
  • reopen
  • return

Be careful: not every word beginning with re- can be meaningfully divided this way in modern English.

Prefixes Showing Time

Pre-

Meaning: before

Examples:

• • prehistoric
  • prepaid
  • precondition
  • preliminary

Post-

Meaning: after

Examples:

• • postgraduate
  • post-war
  • post-election
  • postnatal

Ante-

Meaning: before

Examples:

• • antecedent
  • antenatal

Prefixes Showing Number

Uni-

Meaning: one

Examples:

• • unilateral
  • uniform
  • unicycle

Bi-

Meaning: two

Examples:

• • bilateral
  • bicycle
  • bilingual

Tri-

Meaning: three

Examples:

• • triangle
  • tricycle
  • trilingual

Multi-

Meaning: many

Examples:

• • multinational
  • multicultural
  • multipurpose

Poly-

Meaning: many

Examples:

• • polygon
  • polytheism

Mono-

Meaning: one

Examples:

• • monologue
  • monochrome
  • monopoly

Prefixes Showing Degree or Size

Micro-

Meaning: small

Examples:

• • microscope
  • microorganism
  • microeconomics

Macro-

Meaning: large

Examples:

• • macroeconomics
  • macrostructure

Mini-

Meaning: small

Examples:

• • minibus
  • minimum
  • miniature

Mega-

Meaning: very large

Examples:

• • megacity
  • megaproject

Super-

Meaning:

• • above
  • beyond
  • excessive

Examples:

• • supernatural
  • superpower
  • superhuman

Hyper-

Meaning: excessive/above normal

Examples:

• • hyperactive
  • hypertension
  • hypersensitive

Hypo-

Meaning: below/deficient

Examples:

• • hypothermia
  • hypoglycaemia

Prefixes Showing Position or Direction

Sub-

Meaning: under/below

Examples:

• • submarine
  • subconscious
  • subdivision

Super-

Meaning: above

Examples:

• • superstructure
  • supernatural

Inter-

Meaning: between/among

Examples:

• • international
  • interpersonal
  • intercontinental

Intra-

Meaning: within

Examples:

• • intrastate
  • intramural
  • intracellular

Compare:

interstate = between states

intrastate = within a state

Trans-

Meaning: across

Examples:

• • transport
  • transnational
  • transcontinental

Extra-

Meaning:

• • outside
  • beyond

Examples:

• • extracurricular
  • extraordinary
  • extraterrestrial

Ex-

Meaning:

• • former
  • out

Examples:

• • ex-president
  • export
  • exclude

Prefixes Showing Opposition or Against

Anti-

Meaning: against

Examples:

• • anti-corruption
  • antibiotic
  • anti-war

Contra-/Counter-

Meaning: against/opposite

Examples:

• • contradict
  • counterattack
  • counterproductive

Prefixes Showing Togetherness

Co-

Meaning: together/jointly

Examples:

• • cooperate
  • co-author
  • coexist

Con-/Com-

Meaning: together/with

Examples:

• • combine
  • connect
  • cooperate

Prefixes Related to Self

Auto-

Meaning: self

Examples:

• • autobiography
  • autonomous
  • automatic

Common Prefixes Table

Prefixes and Spelling

Some prefixes may require a hyphen.

Examples:

• ex-president
• self-control
• anti-inflammatory
• re-enter

Hyphen use depends partly on established spelling conventions.

Always consult standard usage for uncertain forms.

Suffixes

A suffix is a group of letters added after a root or base word.

Suffixes often change the part of speech of a word.

Example: happy → happiness

• • happy = adjective
  • happiness = noun

Another: quick → quickly

• • quick = adjective
  • quickly = adverb

Noun-Forming Suffixes

-ness

Forms nouns expressing a state or quality.

Examples:

• • happy → happiness
  • kind → kindness
  • dark → darkness
  • weak → weakness

-ment

Forms nouns indicating action, result, or condition.

Examples:

• • develop → development
  • improve → improvement
  • govern → government
  • achieve → achievement

-tion / -sion / -ation

Forms nouns, often from verbs.

Examples:

• • act → action
  • educate → education
  • decide → decision
  • inform → information
  • organise → organisation

-ity

Forms abstract nouns.

Examples:

• • active → activity
  • equal → equality
  • possible → possibility
  • responsible → responsibility

-ance / -ence

Examples:

• • perform → performance
  • attend → attendance
  • exist → existence
  • differ → difference

-er / -or

Often denotes a person who performs an action.

Examples:

• • teach → teacher
  • write → writer
  • act → actor
  • inspect → inspector

-ist

Often denotes a person associated with a profession, belief, field, or activity.

Examples:

• • art → artist
  • science → scientist
  • social → socialist
  • biology → biologist

-ism

Often refers to a belief, doctrine, system, or practice.

Examples:

• • nationalism
  • socialism
  • capitalism
  • realism

-ship

State, condition, position, or relationship.

Examples:

• • friendship
  • leadership
  • membership
  • citizenship

-hood

State, condition, or period.

Examples:

• • childhood
  • brotherhood
  • neighbourhood

Adjective-Forming Suffixes

-ful

Meaning: full of/having

Examples:

• • care → careful
  • hope → hopeful
  • beauty → beautiful
  • use → useful

-less

Meaning: without

Examples:

• • careless
  • hopeless
  • useless
  • powerless

-ous

Examples:

• • danger → dangerous
  • courage → courageous
  • fame → famous

-al

Examples:

• • nation → national
  • region → regional
  • environment → environmental

-ive

Examples:

• • act → active
  • attract → attractive
  • create → creative

-able / -ible

Meaning: capable of

Examples:

• • read → readable
  • accept → acceptable
  • access → accessible
  • sense → sensible

-ic

Examples:

• • economy → economic
  • history → historic
  • science → scientific

-ish

Meaning:

• having qualities of
• somewhat

Examples:

• • child → childish
  • fool → foolish
  • green → greenish

-y

Examples:

• • cloud → cloudy
  • rain → rainy
  • health → healthy

Verb-Forming Suffixes

-ise / -ize

Examples:

• • modern → modernise/modernize
  • national → nationalise/nationalize
  • legal → legalise/legalize

British English often permits -ise, while -ize is also standard in many dictionaries and is dominant in American English.

-ify

Meaning: make or become

Examples:

• • simple → simplify
  • pure → purify
  • class → classify
  • beauty → beautify

-en

Meaning: make or become

Examples:

• • strength → strengthen
  • wide → widen
  • short → shorten
  • bright → brighten

Adverb-Forming Suffixes

-ly

The most common adverb-forming suffix.

Examples:

• • quick → quickly
  • careful → carefully
  • happy → happily
  • slow → slowly

However, not every word ending in -ly is an adverb.

Examples:

• • friendly
  • lovely
  • lively
  • lonely

These are normally adjectives.

Common Suffixes Table

Spelling Changes with Suffixes

Word formation often changes spelling.

• happy + ness → happiness .  Here, The y changes to i.
• easy + ly → easily
• beauty + ful → beautiful
• create + ion→ creation
• decide + sion → decision
• permit + ion → permission

Therefore, word formation requires knowledge of spelling patterns, not merely suffix meanings.

Word Families

A word family is a group of words formed from the same root or base and related in meaning.

Learning vocabulary through word families is highly effective for competitive examinations because one root can generate several useful words.

Act Family

Beauty Family

• • beauty → noun
  • beautiful → adjective
  • beautifully → adverb
  • beautify → verb

Examples:

The beauty of the landscape attracted tourists.

It is a beautiful place.

The garden was beautifully maintained.

The municipality plans to beautify the area.

Care Family

• care → noun/verb
• careful → adjective
• carefully → adverb
• careless → adjective
• carelessly → adverb
• carelessness → noun

Create Family

• create → verb
• creation → noun
• creative → adjective
• creatively → adverb
• creativity → noun
• creator → noun

Decide Family

• decide → verb
• decision → noun
• decisive → adjective
• decisively → adverb
• indecisive → adjective
• indecision → noun

Develop Family

• develop → verb
• development → noun
• developed → adjective
• developing → adjective
• developmental → adjective
• developer → noun

Educate Family

• educate → verb
• education → noun
• educational → adjective
• educationally → adverb
• educator → noun
• educated → adjective

Employ Family

• employ → verb
• employee → noun
• employer → noun
• employment → noun
• unemployed → adjective
• unemployment → noun
• employable → adjective

Govern Family

• govern → verb
• government → noun
• governor → noun
• governance → noun
• governmental → adjective

Help Family

• help → noun/verb
• helpful → adjective
• helpless → adjective
• helpfully → adverb
• helplessly → adverb
• helplessness → noun

Nation Family

• nation → noun
• national → adjective
• nationally → adverb
• nationality → noun
• nationalism → noun
• nationalist → noun/adjective
• nationalise → verb
• international → adjective
• multinational → adjective/noun

Produce Family

• produce → verb/noun depending pronunciation and context
• product → noun
• production → noun
• productive → adjective
• productivity → noun
• producer → noun

Protect Family

• protect → verb
• protection → noun
• protective → adjective
• protector → noun
• protected → adjective
• unprotected → adjective

Success Family

• success → noun
• succeed → verb
• successful → adjective
• successfully → adverb
• unsuccessful → adjective
• unsuccessfully → adverb

Strength Family

• strength → noun
• strong → adjective
• strongly → adverb
• strengthen → verb

Word Families Revision Table

Formation of Nouns/Adjectives/Verbs/Adverbs

Word formation frequently involves changing one part of speech into another.

This is extremely important in competitive examinations because the blank in a sentence may require a specific grammatical category.

• Consider: ‘success’

  -Noun: Her success surprised everyone.

  -Verb: She succeeded in the examination.

  -Adjective: She was successful.

  -Adverb: She completed the task successfully.

The meaning remains related, but the grammatical function changes.

Formation of Nouns

Nouns can be formed from:

• • verbs
  • adjectives
  • other nouns

Verb → Noun

Common patterns:

-tion / -sion

• • act → action
  • educate → education
  • decide → decision
  • expand → expansion

-ment

• • develop → development
  • achieve → achievement
  • govern → government
  • improve → improvement

-al

• • arrive → arrival
  • refuse → refusal
  • approve → approval

-ance / -ence

• • perform → performance
  • exist → existence
  • differ → difference

-er / -or

• • teach → teacher
  • write → writer
  • act → actor
  • direct → director

Adjective → Noun

-ness

• • happy → happiness
  • kind → kindness
  • weak → weakness

-ity

• • active → activity
  • equal → equality
  • possible → possibility

-ence / -ance

• • confident → confidence
  • important → importance

Examples:

• His kindness impressed everyone.
• Equality before law is an important principle.

Formation of Adjectives

Adjectives may be formed from nouns or verbs.

Noun → Adjective

-ful

• • care → careful
  • hope → hopeful
  • beauty → beautiful

-less

• • care → careless
  • hope → hopeless
  • power → powerless

-al

• • nation → national
  • region → regional
  • culture → cultural

-ous

• • danger → dangerous
  • courage → courageous

-y

• • rain → rainy
  • cloud → cloudy
  • health → healthy

Verb → Adjective

-ive

• • attract → attractive
  • act → active
  • create → creative

-able / -ible

• • read → readable
  • accept → acceptable
  • access → accessible

-ed / -ing

These can also form participial adjectives.

Examples:

• • interest → interested / interesting
  • bore → bored / boring
  • excite → excited / exciting

Compare:

The lecture was interesting : -ing often describes the thing causing the feeling.

The students were interested : -ed often describes the person or thing experiencing the feeling.

Formation of Verbs

Verbs may be formed from nouns or adjectives.

-ise / -ize

• • modern → modernise
  • national → nationalise
  • legal → legalise
  • symbol → symbolise

-ify

• • simple → simplify
  • pure → purify
  • class → classify
  • beauty → beautify

-en

• • strength → strengthen
  • wide → widen
  • short → shorten
  • bright → brighten

Prefix-Based Verb Formation

Sometimes prefixes form new verbs.

Examples:

en-

• • able → enable
  • large → enlarge
  • rich → enrich

de-

• • code → decode
  • forest → deforest

re-

• • write → rewrite
  • build → rebuild

Formation of Adverbs

The most common method is:

Adjective + -ly

Examples:

• • slow → slowly
  • careful → carefully
  • successful → successfully
  • complete → completely

Spelling Rules for -ly

happy → happily . Here, y changes to i.

• easy → easily
• true → truly

Some words drop the final e.

basic → basically

Adjectives and Adverbs with the Same Form

Some words function as both adjective and adverb without adding -ly.

Examples:

• fast

  – Adjective: He drives a fast car.

  – Adverb: He drives fast.

• hard

 – Adjective: This is a hard task.

 – Adverb: She works hard.

• early

 – Adjective : We caught an early train.

 – Adverb : We arrived early.

• late

-Adjective : The late train caused problems.

-Adverb: He arrived late.

-ly Words That Are Not Adverbs

Do not assume that every word ending in -ly is an adverb.

The following are usually adjectives:

• • friendly
  • lovely
  • lonely
  • lively
  • elderly
  • costly

Correct : She is friendly.

Not: She spoke friendly. ✘

Better: She spoke in a friendly manner.

Noun–Verb–Adjective–Adverb Table

Part-of-Speech Clues in Sentences

A major examination skill is identifying what type of word a blank requires.

After an Article

After: a / an / the , a noun is often expected, though an adjective may come before the noun.

Example: The rapid _____ of the city created problems.

Options may include:

• • expand
  • expansion
  • expansive
  • expansively

Correct: expansion , because the structure requires a noun.

After a Linking Verb

After verbs such as:

• • be
  • seem
  • become
  • appear
  • look
  • feel

an adjective is often required.

Example:  She seems _____.

Correct: confident

Not: confidently ✘

Modifying a Verb

An adverb is often required.

Example: She answered the question _____.

Correct: confidently

Before a Noun

An adjective is often required.

Example: It was a _____ decision.

Correct: wise

After a Modal

After:

• • can
  • could
  • may
  • might
  • shall
  • should
  • will
  • would
  • must

use the base form of a verb.

• Example: The policy may _____ economic growth.

Correct: encourage

Word Formation in Fill-in-the-Blank Questions

Example:

• The government announced several measures for the _____ of rural infrastructure.

Root: develop

Possible forms:

• • develop
  • development
  • developmental
  • developmentally

The phrase: for the _____ of — requires a noun.

Correct: development

Another:

• The programme was _____ implemented.

Root: success

Possible forms:

• • success
  • succeed
  • successful
  • successfully

The blank modifies implemented, a verb.

Therefore an adverb is needed.

Correct: successfully

Another:

• The programme proved highly _____.

The blank follows proved, functioning as a linking verb.

Therefore an adjective is required.

Correct: successful

Negative Word Formation

Prefixes are frequently used to form antonyms.

Examples:

• • possible → impossible
  • legal → illegal
  • regular → irregular
  • honest → dishonest
  • happy → unhappy
  • responsible → irresponsible
  • active → inactive

However, the correct negative prefix must be learned with the word.

Correct: illegal :; Not: unlegal ✘

Correct: impossible ;:Not: unpossible ✘

Correct: irregular ;: Not: inregular ✘

Common Negative Forms

Common Word-Formation Errors

• Incorrect: He completed the work successful. ✘
• Correct: He completed the work successfully. ✔

Reason: An adverb is required to modify completed.

• Incorrect: She is a successfully candidate. ✘
• Correct: She is a successful candidate. ✔

Reason: An adjective is required before the noun candidate.

• Incorrect: The develop of the region is rapid. ✘
• Correct: The development of the region is rapid. ✔

• Incorrect: He behaved very rude. ✘
• Correct: He behaved very rudely. ✔

• Incorrect:The news made everyone happiness. ✘
• Correct: The news made everyone happy. ✔

Here, happy functions as an object complement.

• Incorrect: This book is very use. ✘
• Correct: This book is very useful. ✔

Frequently Tested Word Families

Common Prefix–Root–Suffix Analysis

• Unemployment : un + employ + ment
• • un = not
  • employ = base
  • ment = noun-forming suffix

Meaning: state of being without employment

• International : inter + nation + al
  • inter = between
  • nation = root/base
  • al = adjective-forming suffix

Meaning: relating to more than one nation

• Irresponsibility : ir + responsible + ity

• • ir = not
  • responsible = base
  • ity = noun-forming suffix

Meaning: state or quality of being irresponsible

• Misinterpretation : mis + interpret + ation
  • mis = wrongly
  • interpret = base
  • ation = noun-forming suffix

Meaning: incorrect interpretation

• Reconstruction : re + construct + ion

• • re = again
  • construct = build
  • ion = noun suffix

Meaning: the process of constructing again

Other Important Word-Formation Processes

Not all English words are formed only through prefixes and suffixes.

Compounding

Two or more words combine to create a new word.

Examples:

• • classroom
  • newspaper
  • railway
  • rainfall
  • toothbrush
  • greenhouse

Compounds may be:

• • closed → notebook
  • hyphenated → well-known
  • open → post office

Conversion

A word changes its grammatical function without changing its form.

Example:

• email

  – Noun: I received an email.

  – Verb: Please email me the document.

• water

  – Noun: Water is essential for life.

  – Verb: Please water the plants.

Clipping

A longer word is shortened.

Examples:

• • examination → exam
  • advertisement → ad
  • laboratory → lab
  • photograph → photo
  • influenza → flu

Blending

Parts of two words combine.

Examples:

• smoke + fog → smog
• breakfast + lunch → brunch
• motor + hotel → motel

Acronyms and Initialisms

Words or abbreviations may be formed from initial letters.

Examples:

NASA

UNESCO

ATM

GDP

Some are pronounced as words, while others are pronounced letter by letter.

Back-Formation

A shorter word is created by removing what appears to be a suffix.

Examples:

editor → edit

donation → donate

babysitter → babysit

Borrowing

English has adopted words from many languages.

Examples:

• • bungalow
  • shampoo
  • jungle
  • tsunami
  • café
  • kindergarten

This shows that English vocabulary develops through many processes.

Quick Method for Word-Formation Questions

When a word-formation question appears:

• • Locate the root/base word.
  • Read the complete sentence.
  • Determine the required part of speech.
  • Look for grammatical clues around the blank.
  • Identify whether a prefix is needed.
  • Identify the suitable suffix.
  • Check spelling changes.
  • Check whether the meaning should be:
    • positive
    • negative
    • opposite
    • repeated
    • before/after
    • person
    • action
    • quality
  • Finally, read the sentence again for natural usage.

Example: The minister spoke _____ about the programme.

Base word: confidence

Possible family:

• • confidence → noun
  • confident → adjective
  • confidently → adverb

Since the blank modifies spoke, the correct answer is: confidently

Revision Table

Key Points to Remember

• A root carries the basic meaning of a word.
• A prefix is added before a root or base.
• A suffix is added after a root or base.
• Prefixes generally modify meaning:
  • un- → not
  • re- → again
  • pre- → before
  • post- → after
  • anti- → against
  • inter- → between
  • intra- → within
  • trans- → across
• Negative prefixes include:
  • un-
  • dis-
  • in-
  • im-
  • il-
  • ir-
  • non-
• Remember:
  • legal → illegal
  • possible → impossible
  • regular → irregular
  • active → inactive
  • honest → dishonest
• Greek roots frequently occur in scientific vocabulary:
  • bio → life
  • geo → earth
  • hydro → water
  • micro → small
  • macro → large
  • tele → distant
  • therm → heat
  • psych → mind
• Latin roots frequently occur in formal English:
  • cred → believe
  • dict → speak
  • port → carry
  • spect → look
  • scrib/script → write
  • struct → build
  • rupt → break
  • vid/vis → see
• Common noun-forming suffixes:
  • -ness
  • -ment
  • -tion/-sion
  • -ity
  • -ance/-ence
  • -er/-or
  • -ship
• Common adjective-forming suffixes:
  • -ful
  • -less
  • -ous
  • -al
  • -ive
  • -able/-ible
  • -ic
• Common verb-forming suffixes:
  • -ise/-ize
  • -ify
  • -en
• The most common adverb-forming suffix is:
  • -ly

• But remember that words such as:

  • friendly
  • lovely
  • lively
  • lonely

  are usually adjectives, not adverbs.

• Learn vocabulary through word families:
  • success → succeed → successful → successfully
  • beauty → beautify → beautiful → beautifully
  • creation → create → creative → creatively
  • decision → decide → decisive → decisively
• In fill-in-the-blank questions, first identify the required:
  • noun
  • verb
  • adjective
  • adverb
• Do not choose a word merely because its meaning appears correct. Its grammatical form must also fit the sentence.

Word formation becomes much easier when vocabulary is studied as a system rather than as isolated words. Learning a single root such as spect, port, cred, dict, or struct, along with common prefixes and suffixes, can help students understand dozens of related words. For competitive examinations, combining root knowledge + grammatical clues + context is one of the most effective ways to solve unfamiliar vocabulary and word-formation questions.