GCSE-readySpelling rules: prefixes, suffixes and homophones
English spelling can seem random, but many words follow patterns. Knowing a few reliable rules, plus the tricky homophones, will fix lots of common mistakes in one go.
Prefixes: just add them
dis + appear = disappear
mis + spell = misspell (so it has a double s)
un + necessary = unnecessary (one c, double s)
Suffix rules
| Rule | Example |
|---|---|
| Drop the final e before a suffix starting with a vowel | hope + ing = hoping |
| Keep the e before a suffix starting with a consonant | hope + ful = hopeful |
| Consonant + y: change y to i (but not before -ing) | happy + ness = happiness; carry + ing = carrying |
| Short vowel + one consonant: double it before a vowel suffix | run + ing = running; stop + ed = stopped |
| Adding -ly to a word ending in l: keep both l's | careful + ly = carefully |
Homophones
there (a place) / their (belonging to them) / they're (they are)
your (belonging to you) / you're (you are)
its (belonging to it) / it's (it is or it has)
Tip: if you can swap in 'it is' or 'they are', you need the apostrophe.
Add the suffixes: make + ing, beauty + ful, swim + er.
- make ends in e and -ing starts with a vowel: drop the e, making.
- beauty is consonant + y: change y to i, beautiful.
- swim has a short vowel and one final consonant: double the m, swimmer.
Answer: making, beautiful, swimmer
Prefixes usually just add on. Drop the e before a vowel suffix, change y to i after a consonant, and double a single final consonant after a short vowel. Check homophones by swapping in the full words.
- Suffix
- Letters added to the end of a word to change its meaning or class: 'ful' in 'hopeful', 'ness' in 'kindness'.
- Prefix
- Letters added to the start of a word to change its meaning: 'un' in 'unhappy', 'mis' in 'misread'.
- Root word
- The main part of a word that prefixes and suffixes are added to: 'help' in 'helpful' and 'unhelpful'.
- Apostrophe
- A mark that shows missing letters (don't, it's) or belonging (the girl's bag, the girls' bags). Never use one for a simple plural.
- Not “hopping”. That is 'hop' + 'ing', which means jumping on one leg.
Try two quick questions
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2 more questions
Try each one, then tap to check.
What is 'make' + 'ing'?
- makeing
- makking
- makeng
- making
Show the answer
Answer: making
Drop the final e before a vowel suffix.
What is 'beauty' + 'ful'?
- beautyful
- beautifull
- beautiful
- beautful
Show the answer
Answer: beautiful
Consonant + y: change y to i.
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Checked by the GCSE-ready editorial team, 17 October 2026. Last updated 2 October 2026. Spotted a mistake? Tell us and we will fix it.