Primary English — Word Building: Prefixes and Suffixes Tutor Prep Guide — six prefixes, six suffixes, three spelling rules

2026-11-14

Tutor lesson-prep guides · Primary English

Most Primary 5 students can add letters to a word but cannot say what changed. They write inhappy for unhappy and treat careless as if it meant careful. Two facts fix most of this: a prefix changes meaning only, a suffix changes word class, and the root never changes. Every misspelling therefore happens at the join. This lesson turns word building into three checkable moves, so an unknown word becomes a route rather than a guess.

Objectives — Students can: 1) state the meaning of six prefixes (un, re, dis, pre, mis, over) and build a word with three of them; 2) say which word class each of six suffixes produces (ful, less, ly, tion, ness, er); 3) apply three spelling rules (double the final consonant, y to i, drop the silent e) to write four word pairs correctly.

01 Prerequisites (3-minute check)

If any of these fails, fix it before the lesson starts.

Skill	Quick check	Pass mark
Knows the base word	Write one sentence each for happy, care, use, write	All four meanings explained in own words
Tells nouns, adjectives and verbs apart	Sort six given words	At least five of six correct
Spells without dropping letters	Write happiness and carefully	Both correct, including the doubled letters

02 Lesson flow (45 minutes)

Time	Stage	Tutor does	Student does
5 minutes	Quick check	Read the three checks, take hands, note who cannot spell happiness	Answer aloud and write down the one item they cannot do
8 minutes	Prefixes	Write un, re, dis, pre, mis, over and give one example each	Offer one word of their own for each prefix
10 minutes	Suffixes	Write six suffixes and ask which word class each one produces	Copy root plus suffix into the table and label the word class
10 minutes	Spelling rules	Show big to bigger, happy to happiness, care to caring	Write two words per rule and read them aloud
7 minutes	Question types	Work one item of each of the four types, steps spoken aloud	Follow the steps, naming the affix before writing
5 minutes	Exit check	Read three items, collect the papers	Answer three items in writing

03 Teaching script (read it out)

Scene 1: Act one: a prefix changes meaning only

Give them the line they can copy: a prefix is a sticker in front of the word; it changes what the word means, not what job it does. Happy is an adjective, and unhappy is still an adjective with the opposite meaning. So with un, never ask which word class it makes. Ask whether the meaning has flipped.

Six to remember: un means not (unhappy, unkind), re means again (rewrite, reuse), dis means not or apart (disagree, disappear), pre means before (preview, prepay), mis means wrongly (mistake, misread), over means too much (overeat, overwork). One example each is enough for Primary 5.

Flag the trap now: un and in both negate, but which one a word takes is habit, not logic. It is unhappy, never inhappy, and incorrect, never uncorrect. When unsure, say the word out loud, because the version that sounds right is usually right, then check a dictionary since real exceptions exist.

A prefix changes meaning, not word class

Scene 2: Act two: a suffix changes word class

A suffix works the other way: it sits behind the word and changes the word class. Care is a verb, careful is an adjective, carefully is an adverb, and careless is an adjective with the opposite meaning. One root, four suffixes, four jobs.

Six suffixes: ful makes an adjective meaning full of (careful, helpful); less makes an adjective meaning without (careless, useless); ly makes an adverb (carefully, quickly); tion makes a noun (action, education); ness makes an abstract noun (happiness, kindness); er makes the person or thing that does it (teacher, computer).

The usual misunderstanding: that a suffix only makes a word longer. Adding ly actually changes the word class. He is careful describes the person, while He writes carefully describes the writing. Put the wrong form in the wrong slot and the sentence stops working.

So the first question on any gap fill is: does this gap need a noun, an adjective or an adverb. Decide the word class first, then choose the suffix. Never choose by feel.

Decide the word class before choosing the suffix

Scene 3: Act three: the error is always at the join

The root is rarely misspelled; the join is. Should the consonant double, should y become i, should the e go. Three rules.

One: before er or est, if a short word ends consonant, vowel, consonant, double the last consonant, so big becomes bigger and hot becomes hotter. Two: if a word ends consonant plus y, change y to i before a suffix, so happy becomes happiness and carry becomes carried. Three: if a word ends in a silent e, drop it before a suffix that starts with a vowel, so care becomes caring and use becomes using, but keep it before a consonant suffix, so care becomes careful.

Have students read each word aloud, because the eye fills in missing letters. Reading hap-pi-ness catches the dropped p that looking at happiness does not.

Every misspelling sits at the join

04 Question types and worked steps

Type	Example	Steps	Answer
Choose the right prefix	unhappy or inhappy	1 read the root meaning 2 test which of the six fits 3 say it aloud 4 if unsure, flag it for the dictionary	unhappy (in goes with correct and complete)
Build a word with a prefix	Make a word with re and write, then use it in a sentence	1 fix the prefix meaning (again) 2 join it to the root 3 confirm the word class is unchanged 4 write a sentence with context	rewrite; I have to rewrite the last paragraph.
Change the word class	Turn happy into a noun and an adverb	1 decide the needed word class 2 noun takes ness, adverb takes ly 3 apply y to i 4 read it aloud to check	happiness (noun), happily (adverb)
Apply a spelling rule	The comparative of big and the ing form of care	1 look at the word ending 2 apply the matching rule 3 write it 4 read it aloud and count the syllables	bigger (double g), caring (drop the e)

Sanity check (teach this): After any affix is added, the backbone of the word must be unchanged. Happy keeps hap-pi (y to i changes the spelling, not the backbone). If a student writes happness or hapiness, the backbone has broken, so respell it on the spot. A second check is meaning: unhappy must be the opposite of happy. If the two read the same, the wrong prefix is in play.

05 Independent practice (3 questions)

Question	Answer	What to watch
Give the meaning of disagree, preview and overwork	To not agree, to look before, to work too much	Whether they name the prefix meaning, not just the whole word
Write care as two adjectives, an adverb and a noun	careful, careless, carefully, and care itself as the noun	Whether they invent careness; whether they know some words take no suffix
Correct: She sings beautifuly. He is a carefull boy.	beautifully, careful	Whether the error sits only at the join and the root survived

06 Common mistakes and what to say

Mistake	Student writes	Say this
Uses in instead of un	inhappy, incareful	Un is the one that fits most words, so try un first and check a dictionary when unsure.
Picks the suffix for the wrong word class	He is carefully. She writes careful.	Ask what the gap describes: a person or an action. An action takes ly.
Forgets y to i	happness, happyly	A consonant plus y becomes i, so write happi first, then add ness.
Drops a doubled letter	biger, hapiness	Read it aloud in beats: hap-pi-ness, three beats, three syllables.

07 Homework (paper, section and question numbers)

Subject index with practice items and answers — Do the three independent practice items, then write three English words for objects at home and add one prefix or suffix to each
Primary 5 English paper, grammar and reading — Do the grammar section only and focus on word class and spelling items

08 Exit check (last 5 minutes)

Question	Answer	Decision
Which word class is unhappy, and why	Adjective, because a prefix changes meaning not word class	Answering noun or verb means act one is retaught
Why does happiness have two p letters	The root happy becomes happi (y to i) and the p stays	Writing hapiness means act three is retaught
Make a word with less and use it in a sentence	careless; He is careless with his homework.	No word or a wrong word class means act two is retaught

09 Tutor FAQ

Should phonics come first for a weak speller?

Target the join, not the whole code. Read the word in syllables (hap-pi-ness) so the missing letter shows up. A phonics course improves decoding, while this lesson builds the habit of finding where the error sits. Run them side by side rather than one instead of the other.

How many affixes are enough for Primary 5

Six prefixes and six suffixes cover most school items in Primary 5 and 6. Rather than memorising twenty, give three examples each and insist students name the word class a suffix produces. Coverage is not the goal; being able to name the word class is.

The school teaches in, im and ir as well, should I add them

Mention once that English has several negating prefixes, then stop. Get un solid before introducing variations, otherwise a Primary 5 student juggles four sets in one lesson and mixes them under pressure.

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A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.