Common prefixes

A chunk of meaning on the front of a word. Peel it off and the word underneath is one a child can already read.

Prefixes and morphology

un- re- dis- pre- mis- in- im- ex- de- MORPH_PREFIX_01

Strong rule · High reliability · Very common · Intermediate · Reading and spelling

• various prefixes: unhappy, return, dislike

Where Wiggler teaches it: Skill 14: Prefixes & Final Mastery

Child explanation

Un- means not. Re- means again. Take the front bit off and you can read the rest.

The rule

A prefix is a fixed chunk on the front of a word that changes its meaning and leaves the root readable. Peel the prefix before dividing the rest into syllables.

What is really going on

Prefix boundaries override the syllable-division patterns: unhappy splits un-happy, not u-nhappy. Most prefixes are unstressed, and several have a reduced vowel — the e of return is schwa, not /iː/. The ones worth teaching first are un-, re-, dis-, pre- and mis-, which between them cover most of what a primary reader will meet.

Position in the word

• Beginning of a word — The defining position. For example: unhappy, return, dislike, preview.

Examples

Easy examples

unhappy, return, dislike, preview, misread

More examples

undo, unlock, unkind, replay, rewrite, disagree, disappear, prepare, mistake, misplace, include, important, export, explain

Advanced examples

impossible, incorrect, irregular, illegal, decide, describe

Contrast pairs

• un-happy versus u-nhappy — The prefix boundary wins over the syllable rule.
• return versus reptile — Not every re at the start is the prefix re-.

Teacher note

Teach un- first and let children find the root themselves: cover the un and read what is left. Warn them gently that not every word starting with re is a re- word — reptile, ready, red — which is a good early lesson in checking whether the answer is a word they know.

Learn these first

• Syllable division — VC/CV · V/CV · VC/V — Where you split a word decides whether its vowel is long or short. Three patterns cover most of English.

Related rules

• Meaning suffixes: -ful, -less, -ness, -ment — -ful -less -ness -ment -able — Chunks of meaning on the end of a word. Unlike -ed and -ing, they leave the root almost untouched, which makes them the easiest suffixes to read.
• Decoding a long word — prefix + root + suffix — Peel the affixes first, then divide what is left, then flex the vowels. A four-syllable word is a sequence of one-syllable problems.
• Syllable division — VC/CV · V/CV · VC/V — Where you split a word decides whether its vowel is long or short. Three patterns cover most of English.
• Latin spelling patterns — -tion / -sion / prefixes / silent scholarly letters — The -tion and -sion endings, the common prefixes, and the letters Renaissance scholars inserted into debt and doubt to show a Latin root.

• Next in Prefixes and morphology: Meaning suffixes: -ful, -less, -ness, -ment — -ful -less -ness -ment -able — Chunks of meaning on the end of a word. Unlike -ed and -ing, they leave the root almost untouched, which makes them the easiest suffixes to read.
• All reading rules

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