You will learn
- Know new prefixes.
- Know new suffixes.
- Change word class with suffixes.
- Build and explain words.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- Find the root.
- Identify the affix.
- Say what it adds.
- Check the new word class.
Words to know
between or among
under or below
makes a noun meaning an action or result
makes an adjective meaning full of
1. Discover: Bigger word families
Tolu builds words. inter- + national = international (between nations). sub- + marine = submarine (under the sea). Create + -ion = creation. Danger + -ous = dangerous (full of danger). He notices that suffixes can also change the word class.
Think: How did -ion change create?
2. Understand: Prefixes and suffixes that change word class
Idea 1: More prefixes
inter- means between (international); sub- means under (submarine); super- means above or beyond; semi- means half.
Idea 2: Suffixes that change class
-ion makes a noun (create → creation). -ous makes an adjective (danger → dangerous). -ity makes a noun (active → activity).
Idea 3: Spelling changes
Sometimes the root changes: create loses the e before -ion.
3. Worked examples
Example 1 (I show you): Inter
What does international mean?
- Between.
Answer: between nations
Example 2 (We do it together): Sub
What does submarine mean?
- Under.
Answer: under the sea
Example 3 (You try): Ion
What does -ion do to create?
Show the steps and answer
- Noun.
Answer: makes the noun creation
Did you know?
The word semicircle means half a circle, and a semicolon is half a colon in name only.
Why this matters
Knowing these affixes helps you read and spell longer words.
4. Explore: Affix lab
Build words.
- Choose five roots.
- Add a prefix or suffix.
- Write the class and meaning.
- Use each in a sentence.
Think about it: what did you notice?
You can build longer words.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- The prefix ___ means ___.
- The suffix ___ makes a ___.
- ___ + ___ = ___.
- The word means ___.
Guided practice
Question 1. inter- means ___.
between
Question 2. sub- means ___.
under
Question 3. -ion makes a ___.
noun
Independent practice
Level 1: Start
- inter- means ___.
- sub- means ___.
- -ion makes a ___.
- -ous makes an ___.
- Dangerous means full of ___.
Level 2: Grow
- Make a noun from act.
- What does semi- mean?
- What is a submarine?
Level 3: Stretch
- Is international between nations?
- Does -ous make a noun?
- Can spelling change before -ion?
Answers are in the answer key below. Try first, then check.
6. Apply: English in everyday life
Make ten words with the new prefixes and suffixes and use each.
Show a sample answer
ten sentences
Another one. Find five words in your reading with these affixes and explain each.
Show a sample answer
a completed task
7. Common mistakes
Fix: Slow down and check your work.
Fix: Study the example first, then try.
8. Lesson summary and revision card
- I can know new prefixes.
- I can know new suffixes.
- I can change word class with suffixes.
- I can build and explain words.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Find the root.
- Identify the affix.
- Say what it adds.
- Check the new word class.
11. Next lesson
Next lesson: Word roots. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- What does inter- mean? Give a word. [2 marks]
- What does sub- mean? Give a word. [2 marks]
- What does -ous do? [1 mark]
- Make a noun from decide. [1 mark]
- Explain how to work out a long word with an affix. [3 marks]
Total: 9 marks.
Marking guide and model answers
- between [1]; international [1]
- under [1]; submarine [1]
- makes an adjective meaning full of [1]
- decision [1]
- find the root [1]; say what the prefix/suffix adds [1]; check the word class and meaning [1]
Score guide: 8 to 9 = secure. 6 to 7 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- inter- means ___.
- sub- means ___.
- -ion makes a ___.
- -ous makes an ___.
- Dangerous means full of ___.
- Make a noun from act.
- What does semi- mean?
- What is a submarine?
- Is international between nations?
- Does -ous make a noun?
Homework
Find five words in your reading with these affixes and explain each.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. inter- means ___. | between | 1 |
| 2. sub- means ___. | under | 1 |
| 3. -ion makes a ___. | noun | 1 |
| 4. -ous makes an ___. | adjective | 1 |
| 5. Dangerous means full of ___. | danger | 1 |
| 6. Make a noun from act. | action | 1 |
| 7. What does semi- mean? | half | 1 |
| 8. What is a submarine? | a boat under the sea | 1 |
| 9. Is international between nations? | yes | 1 |
| 10. Does -ous make a noun? | no | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 between; 2 under; 3 noun; 4 adjective; 5 danger. Level 2: 1 action; 2 half; 3 a boat under the sea. Level 3: 1 yes; 2 no; 3 yes.
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Know new prefixes | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Know new suffixes | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Change word class with suffixes | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Build and explain words | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: Rushing without checking. Slow down and check your work.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Re-read the examples slowly and use the sentence frames.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child practises a key Grade 3 English skill with clear examples and a quiz. You do not need to be an expert to help.
- Listen while your child explains the idea.
- Ask for one new example.
- Praise effort and careful work.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: know new prefixes; know new suffixes; change word class with suffixes; build and explain words.
Prerequisite knowledge. Word relationships.
Materials. Chart paper or board, pencils, picture or word cards, a reading book if available. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Write the key words and examples on the board or on cards before the lesson.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Introduce the idea with the opening example.
Explanation (10 min). Teach the key words.
Guided activity (10 min). Practise together.
Independent activity (10 min). Check understanding with the quiz.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What is the key idea? Can I give my own example?
Teacher explanation notes. Move from the spoken word to pictures and then to print. Read aloud often, point to the words, and let learners hear and say before they read and write.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use the sentence frames and work with a partner. Extension. Create a harder example of your own.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. Rushing without checking. Slow down and check your work.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 9-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Re-read the examples slowly and use the sentence frames. Enrichment. Make up your own example and teach it to someone at home. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Common Core State Standards for English Language Arts, Cambridge Primary and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Official standards for this topic area. Common Core State Standards for English Language Arts (official site): Grade 4 » Language. These pages list the standards that cover this topic area; read them alongside the lesson.
Research used to shape this lesson. Common Core L.4.4b and L.4.2; Cambridge Primary English Stage 4 (spelling and word structure). These sources informed the lesson.