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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.

PrefixMeaningExample
un-notunhappy = not happy
re-againredo = do again

Level 2 — Suffixes: -ful and -less

Verbal: Adding a suffix changes the end of the word.

SuffixMeaningExample
-fulfull ofhelpful = full of help
-lesswithouthelpless = 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

MistakeWhy it happensFix
Mixing up un- and re-Both change meaning but differentlyun- = not, re- = again
Mixing up -ful and -lessOpposite suffixes look similar-ful = full of, -less = without
Adding both a prefix and wrong suffixOvercorrectingAdd only the affix the meaning needs
Misspelling the base wordRushingCheck 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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