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What are Prefixes and Suffixes?

Prefixes and suffixes are morphemes added to root words to create new words. Prefixes go at the start (un-, re-) to modify meaning; suffixes go at the end (-tion, -ness) to change word class. Together they form the backbone of English word formation.

Short answer

Prefixes and suffixes are letter sequences added to root words — prefixes at the start (un-, re-, dis-) and suffixes at the end (-tion, -ness, -ful) — to create new words and meanings.

Prefix + Root + Suffix = New Word

1
Prefix
un-, re-, dis-, pre-, anti-, over-, under-, non-
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2
Root Word
happy, do, appear, kind, friend, care
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3
Suffix
-tion, -ness, -ful, -less, -able, -ly, -ment, -ize
↓
4
Result
unhappy, redo, disappear, kindness, friendly, careful, careless

Step-by-step worked examples

Build a word: unhappy + suffix -ness

unhappy = adjective (un- + happy)
Add -ness (makes noun): unhappiness
Meaning: the state of being unhappy

Analyze 'disagreement': prefix + root + suffix

dis- (prefix) + agree (root) + -ment (suffix)
Meaning: lack of agreement

Create a word from 'care': care + un- + -ful + -ness

care → careful (care + -ful)
careful → uncaring (un- + care) → careless (care + -less)
careless + -ness → carelessness (state of being careless)

Flashcards

Quick quiz

Q1.What does the prefix 'un-' mean?

Correct answer: B. un- negates: unhappy = not happy. re- = again; pre- = before.

Q2.Which suffix makes an adjective into a noun?

Correct answer: B. -ness creates nouns from adjectives: happy → happiness. -ly creates adverbs.

Q3.Analyze 'uncomfortably': how many morphemes?

Correct answer: D. un- (prefix) + comfort (root) + -able (suffix) + -ly (suffix) = 4 morphemes.

Q4.What does 'dis-' prefix mean?

Correct answer: A. dis- negates or reverses: dislike, disconnect, disagree (opposite of agree).

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Common mistakes

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Confusing prefixes and suffixes — adding them to wrong end. — Correct: Prefix = start (un-, re-); suffix = end (-tion, -ness).

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Ignoring word-class changes from suffixes. — Correct: happy (adj) + -ness → happiness (noun); happy + -ly → happily (adverb).

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Forcing a prefix/suffix onto a word that won't take it. — Correct: Some words resist affixes — chair → *unchair ✗, not normal.

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Doubling letters when adding suffixes. — Correct: Usually: happy + -ness = happiness (not hapiness). Care with 'e' words (hope + -ful = hopeful).

FAQ

What are prefixes and suffixes?

Morphemes (word parts): prefixes at the start (un-, re-) and suffixes at the end (-tion, -ness) that create new words from roots.

Can a word have both prefix and suffix?

Yes — unhappily = un- (prefix) + happy (root) + -ly (suffix). Multiple affixes combine.

What is the difference between -able and -ible?

-able is more common; -ible rarer (sensible, horrible, edible). Both mean 'can be/worthy of.'

How many prefixes and suffixes are there?

Many common ones: un-, re-, dis-, pre-, anti-, over-, under-, -tion, -ness, -ful, -less, -ly, -able, -ment, -ize.