Word Formation
Master word formation in English: prefixes, suffixes, compound words, conversion, and abbreviations. Essential for expanding your vocabulary.
What is Word Formation?
Word formation is the process of creating new words from existing words using prefixes, suffixes, and other methods. It is essential for expanding your vocabulary and understanding the meaning of unknown words.
📋 Quick Reference
Prefixes
Prefixes are added to the beginning of a word to change its meaning.
| Prefix | Meaning | Example | Base Word |
|---|---|---|---|
| un- | Negative | unhappy | happy |
| re- | Again | rewrite | write |
| pre- | Before | preview | view |
| dis- | Negative | disagree | agree |
| mis- | Wrongly | misunderstand | understand |
| over- | Excess | overcook | cook |
| under- | Below | underestimate | estimate |
| non- | Not | non-smoker | smoker |
Estoy infeliz con el resultado
I am unhappy with the result
I am unhappy with the result
Necesito reescribir este ensayo
I need to rewrite this essay
I need to rewrite this essay
Malentendí tus instrucciones
I misunderstood your instructions
I misunderstood your instructions
Using Prefixes
Prefixes do not change the grammatical category of the word:
- Happy (adj) → Unhappy (adj)
- Write (verb) → Rewrite (verb)
- Agree (verb) → Disagree (verb)
Suffixes
Suffixes are added to the end of a word to change its grammatical category or meaning.
| Suffix | Category | Example | Base Word |
|---|---|---|---|
| -ly | Adverb | quickly | quick |
| -tion/-sion | Noun | education | educate |
| -ful | Adjective | beautiful | beauty |
| -less | Adjective | hopeless | hope |
| -er/-or | Noun | teacher | teach |
| -ness | Noun | happiness | happy |
| -able/-ible | Adjective | comfortable | comfort |
| -ment | Noun | development | develop |
Corre rápidamente
He runs quickly
He runs quickly
La educación es importante
Education is important
Education is important
Es una situación sin esperanza
It's a hopeless situation
It's a hopeless situation
Category Changes with Suffixes
Suffixes can change the grammatical category:
- Quick (adj) → Quickly (adv)
- Educate (verb) → Education (noun)
- Hope (noun) → Hopeless (adj)
Compound Words
Compound words are formed by joining two or more words to create a new word with a specific meaning.
| Type | Form | Example | Meaning |
|---|---|---|---|
| Noun + Noun | toothbrush | tooth + brush | toothbrush |
| Adjective + Noun | blackboard | black + board | blackboard |
| Verb + Noun | swimming pool | swimming + pool | swimming pool |
| Noun + Verb | sunrise | sun + rise | sunrise |
| Adjective + Adjective | red-hot | red + hot | red-hot |
Uso un cepillo de dientes todas las mañanas
I use a toothbrush every morning
I use a toothbrush every morning
El profesor escribe en la pizarra
The teacher writes on the blackboard
The teacher writes on the blackboard
Vamos a nadar a la piscina
We go swimming at the swimming pool
We go swimming at the swimming pool
Forming Compounds
Compound words can be written:
- Together: toothbrush, bedroom, notebook
- With a hyphen: mother-in-law, state-of-the-art
- Separate: swimming pool, ice cream
Conversion
Conversion is changing the grammatical category of a word without modifying its form.
| Original Word | New Category | Example | Meaning |
|---|---|---|---|
| walk (verb) | noun | go for a walk | go for a walk |
| email (noun) | verb | email me | email me |
| green (adj) | noun | the greens | the greens (vegetables) |
| water (noun) | verb | water the plants | water the plants |
| clean (adj) | verb | clean the room | clean the room |
Voy a dar un paseo
I'm going for a walk
I'm going for a walk
Envíame un email
Email me
Email me
Riega las plantas
Water the plants
Water the plants
Abbreviations and Acronyms
Abbreviations and acronyms are short forms of long words or phrases.
| Type | Example | Full Form | Meaning |
|---|---|---|---|
| Abbreviation | ad | advertisement | advertisement |
| Abbreviation | info | information | information |
| Acronym | NASA | National Aeronautics and Space Administration | NASA |
| Acronym | UNESCO | United Nations Educational, Scientific and Cultural Organization | UNESCO |
| Acronym | ATM | Automated Teller Machine | ATM |
Vi un anuncio en el periódico
I saw an ad in the newspaper
I saw an ad in the newspaper
Necesito más información
I need more info
I need more info
NASA envió una nave espacial
NASA sent a spacecraft
NASA sent a spacecraft
Common Mistakes
Correct: "unhappy" ✅
Prefixes are written attached to the base word
Correct: "quickly" ✅
Do not add suffixes to words that already have them
Correct: "toothbrush" ✅
Compound words are written together
Correct: "I will email you" ✅
When 'email' is a verb, it does not need 'to'
Important Rules
1. Prefixes and spelling
Prefixes do not change the spelling of the base word.
- Happy → Unhappy (no 'un-happy')
- Write → Rewrite (no 're-write')
2. Suffixes and spelling changes
Some suffixes require changes in the base word.
- Happy → Happiness (y → i)
- Run → Running (double n)
- Love → Lovable (e is dropped)
3. Compound words
The meaning may differ from the sum of the parts.
- Blackboard (blackboard, not 'black board')
- Hot dog (hot dog, not 'hot dog' literally)