Clever Clogs Academy

Which rule am I in? spelling patterns

The Short Answer

Spelling questions in the 11+ lean on a small number of patterns. The difficulty at this level is not the rules themselves but working out which rule you are in, so ask four questions in a fixed order: is this a plural, is something added to the front, is something added to the end, or does another word sound exactly the same? Naming the question is half the answer.

What do 11+ spelling questions test?

Not spelling in general — a handful of patterns the paper returns to. Plurals that break the ordinary rule, prefixes, suffixes, and words that sound identical and are spelled differently.

By Year 5 your child almost certainly knows these rules. The difficulty is knowing which rule they are in, and that is what costs the marks.

Four questions, in this order

Is this a plural? Then look at the last letter of the singular — and check whether it is one of the words that break the pattern.

Is something added to the front? Then it is a prefix, and the root does not change.

Is something added to the end? Then it is a suffix, and the root may change — so check how it ends.

Is there another word that sounds exactly the same? Then stop, and say what this one means before writing anything.

Naming the question is genuinely half the answer. A child who says "this is a suffix" has already narrowed twenty rules to two.

The plurals that break the pattern

Three groups, and only the third is really a memory job.

Words that change inside rather than taking the ordinary ending: tooth becomes teeth and mouse becomes mice, where the vowels change and nothing is added on the end. Child becomes children, which belongs with them as an irregular plural but does take an ending of its own, -ren.

Words English borrowed. A Latin word ending in -us often takes -i: fungus, fungi. A Greek word ending in -is swaps to -es: crisis, crises. Oasis, oases.

Words that do not change at all: sheep, deer, salmon, aircraft, species. One sheep, four sheep.

These cannot be worked out from a rule and have to be learnt — but there are far fewer than most people expect, and the papers use the same handful over and over.

The diagram takes three of those words and shows what happens to each: a vowel change, an irregular ending, and a plural that is spelled exactly like the singular.

Three paired word cards show tooth to teeth, child to children and aircraft unchanged. Notes distinguish vowel change, irregular ending and unchanged form.
Tooth becomes teeth by a vowel change. Child becomes children with an irregular ending. Aircraft has the same singular and plural spelling. Learn each whole form rather than applying add-s to every word.View full size diagram (opens in a new tab)

Prefixes leave the root alone

This is the distinction that decides most of the rest.

A prefix goes on the front and the root is untouched: possible is still spelled possible inside impossible; necessary is still necessary inside unnecessary.

A suffix goes on the end, and the root may change or may stay exactly as it was: happy becomes happiness and travel becomes travelling, but kind becomes kindness and help becomes helpful with nothing altered.

One further wrinkle worth knowing: the prefix itself sometimes changes shape to suit the word that follows. In- becomes im- before a p — impossible, impatient — and il- before an l. The root still does not change, which is the part that matters.

Where do pupils lose marks?

Not naming the family, and applying the ordinary rule to a word that breaks it.

Changing the root after a prefix, which produces spellings like unecessary.

Answering a homophone question by sound. If two words sound the same, sound cannot decide it — only meaning can, which is why that question stops your child rather than speeding them up.

Try it yourself

For each one, name which of the four questions you are in before you answer.

  1. What is the plural of crisis?
  2. What is the plural of aircraft?
  3. Spell the word meaning 'not possible' using a prefix.
  4. Add -ing to travel.
  5. Which is correct: five deers or five deer?

How much practice does this type need at home?

Ten minutes twice a week, and sorting beats copying. Give your child six words and ask which of the four families each belongs to before spelling any of them.

That builds the skill the paper actually tests, and it works on words your child has never seen — which writing out a list of twenty does not.

Free: an English workbook

Questions across the English question types, with the method printed at the top and full answers at the back. One workbook for the whole strand, not a sheet per question type.

Frequently Asked Questions

Why teach an order rather than the rules themselves?

Because by Year 5 most children know the rules and still get the questions wrong. What defeats them is not knowing which rule they are in — applying the add-an-s plural rule to deer, or changing a root after a prefix as though it were a suffix. Four questions in a fixed order sorts that out in a couple of seconds, and once the family is named the rule usually comes automatically.

What is the difference between a prefix and a suffix, for spelling?

A prefix goes on the front and leaves the root alone: possible stays possible inside impossible, and necessary stays necessary inside unnecessary. A suffix goes on the end and may change the root — happy becomes happiness, travel becomes travelling — or may leave it exactly as it was, as in kindness and helpful. That single difference decides a great many spelling questions, and it is worth saying aloud rather than assuming.

Which plurals actually have to be learnt?

Fewer than parents fear. The ones that change a vowel inside — tooth and teeth, mouse and mice. Child and children, which takes an irregular ending of its own. The borrowed ones — fungus and fungi, crisis and crises, oasis and oases. And the ones that do not change at all — sheep, deer, salmon, aircraft, species. The papers use the same handful repeatedly, so a short list learnt properly covers most of what comes up.

How should we practise spelling at home?

Not by writing words out ten times, which teaches the hand rather than the eye. Better is to sort: give your child six words and ask which family each belongs to before spelling any of them. Naming the family is the skill the paper tests, and it transfers to words they have never seen — which copying out a list does not.

Topics

Sources

  • GL Assessment — 11+ familiarisation materials and question type descriptions Published 2025.
  • Clever Clogs Academy — our own Year 4 and Year 5 lesson records, Winslow Published September 2025 to July 2026.

We are not affiliated with, endorsed by or connected to GL Assessment or Buckinghamshire Council. Test arrangements change; always check the council's own pages for the current year's dates.

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