Prefixes And Suffixes
Vocabulary Building: Prefixes And Suffixes
Prefixes And Suffixes
Prefixes And Suffixes
What you'll learn
- A prefix is added to the beginning of a word to change its meaning — un + happy = unhappy.
- A suffix is added to the end of a word to change its meaning — help + ful = helpful.
- un- means "not"; re- means "again"; -ful means "full of"; -less means "without".
- To build new words and understand their meanings using prefixes and suffixes.
Key concepts
Level 1 — Prefixes: un- and re-
Verbal: Adding a prefix changes the beginning of the word but keeps the base word inside it.
| Prefix | Meaning | Example |
|---|---|---|
| un- | not | unhappy = not happy |
| re- | again | redo = do again |
Level 2 — Suffixes: -ful and -less
Verbal: Adding a suffix changes the end of the word.
| Suffix | Meaning | Example |
|---|---|---|
| -ful | full of | helpful = full of help |
| -less | without | helpless = without help |
Real-life: care + ful = careful (full of care); care + less = careless (without care) — opposite meanings from the same base word!
Worked example
Add a prefix to 'lock' to mean 'open again' or 'not locked'.
Step 1 — 'Not locked' needs the prefix un-.
Step 2 — un + lock = unlock.
Answer: unlock
Add a suffix to 'hope' to mean 'without hope'.
Step 1 — 'Without' points to the suffix -less.
Step 2 — hope + less = hopeless.
Answer: hopeless
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| Mixing up un- and re- | Both change meaning but differently | un- = not, re- = again |
| Mixing up -ful and -less | Opposite suffixes look similar | -ful = full of, -less = without |
| Adding both a prefix and wrong suffix | Overcorrecting | Add only the affix the meaning needs |
| Misspelling the base word | Rushing | Check the base word spelling first |
Quick check
- Add re- to 'fill' to mean 'fill again': ?
- Add -ful to 'joy': ?
- Add -less to 'fear': ?
- Stretch: Take the word 'care' and write both its -ful and -less forms in a sentence each.
Revision tip: List five words with un- or re- and five with -ful or -less from your reading book.
Open the Practice tab for graded questions on Prefixes And Suffixes.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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