Why does 'running' have two N's but 'raining' only has one?

It comes down to vowels. 'Run' has a single vowel (U) followed by a single consonant (N), so the N doubles before -ing. 'Rain' has two vowels (AI) before the N, which means the consonant stays single. The double vowel already protects the vowel sound, so there's no need to double.

Does the doubling rule apply to words of any length?

For longer words, you also need to check where the stress falls. If the stress is on the last syllable (be-GIN, oc-CUR), you double the final consonant. If the stress is on an earlier syllable (VI-sit, LI-sten), you don't. That's why it's 'beginning' (double N) but 'visiting' (single T).

How do I remember which words like 'accommodation' have double letters?

Memory tricks work best. For accommodation, think: a hotel big enough for two Comfortable Couples needs two C's, two M's. For committee, remember: a committee is too important for single letters, so it has double M, double T, and double E. Make the trick personal and it sticks.

Is 'travelled' spelled with one L or two?

In British English, it's two L's: travelled. This is because British English doubles the final L even when the stress isn't on the last syllable, which is an exception to the usual rule. American English uses one L (traveled). For 11+ exams in the UK, always use the British spelling with double L.

What should I do if I can't hear where the stress falls in a word?

Try saying the word in an exaggerated way, stretching out each syllable. The syllable you naturally make louder and longer is the stressed one. For 'begin', you naturally say 'be-GIN' — the second syllable is stronger. For 'visit', you say 'VI-sit' — the first syllable is stronger. Practise with words you know first, and the skill transfers to unfamiliar ones.

Double Letter Spelling Rules for 11+

Why Double Letters Trip People Up

Double letters are one of the slipperiest corners of English spelling. You can't always hear whether a consonant is doubled just by listening, and the rules aren't obvious unless someone spells them out for you. Is it "accomodate" or "accommodate"? "Occured" or "occurred"? "Dissappoint" or "disappoint"?

The good news is that there are patterns. They won't cover every word, but they'll cover most of the ones that come up in 11+ exams. And for the handful of oddballs that don't follow the rules, a good memory trick sorts them out.

Key Takeaway: Double-letter mistakes are among the most common spelling errors in 11+ papers. Learning the suffix doubling rule and memorising about a dozen high-value words will fix the vast majority of them.

Student practising spelling with pencil and notebook

The 1-1-1 Doubling Rule

This is the core rule, and it covers a huge number of words. It's called the 1-1-1 rule because of three conditions that must all be true:

1 syllable (or the stress falls on the last syllable)
1 vowel before the final consonant
1 consonant at the end

If all three conditions are met, double the final consonant before adding a suffix that starts with a vowel (-ing, -ed, -er, -est, -en).

run → running, runner (1 syllable, 1 vowel U, 1 consonant N)
stop → stopped, stopping (1 syllable, 1 vowel O, 1 consonant P)
big → bigger, biggest (1 syllable, 1 vowel I, 1 consonant G)
hot → hotter, hottest
swim → swimmer, swimming
plan → planned, planner

Why does it matter? Doubling protects the short vowel sound. Without it, the meaning changes: hopping (jumping) vs hoping (wishing); tapping (knocking) vs taping (recording). The double consonant tells the reader to keep the vowel short.

Stress Matters for Longer Words

For words with two or more syllables, the doubling rule still applies, but only when the stress is on the final syllable.

be-GIN → beginning, beginner (stress on GIN)
oc-CUR → occurred, occurrence (stress on CUR)
for-GET → forgetting, forgettable (stress on GET)
pre-FER → preferred, preferring (stress on FER)
ad-MIT → admitted, admittance (stress on MIT)
re-GRET → regretted, regrettable (stress on GRET)

When the stress shifts away from the final syllable, some words don't double. "Prefer" becomes "preferred" (stress stays on FER), but "preference" (stress moves to PRE) has a single R. This is an advanced pattern that 11+ examiners don't usually test directly, but it's good to be aware of.

When NOT to Double

The rule has clear exceptions. Don't double the final consonant when:

There are two vowels before the consonant: rain → raining, seat → seated, meet → meeting
The word ends in two consonants: jump → jumping, hard → harder, want → wanted
The stress is on an earlier syllable: VI-sit → visiting, LI-sten → listening, HAP-pen → happened
The suffix starts with a consonant: sad → sadness, fit → fitness (only double before vowel-starting suffixes)

British English quirk: In British English, the letter L is doubled even when the stress isn't on the final syllable. So it's travelled, cancelled, labelled, and marvellous in British spelling. American English uses a single L. For the 11+, always use British spellings.

Words with Built-In Double Letters

Some words simply arrive with double letters already inside them. These aren't about adding suffixes at all. They're words you need to memorise because you can't reliably hear the doubles when speaking.

Double C and double M:

accommodation — two C's, two M's
accompany — two C's
accumulate — two C's
communicate — two M's
recommend — one C, two M's
immediate — two M's

Double S:

necessary — one C, two S's
possess — two S groups (really: po-ss-e-ss)
embarrass — two R's, two S's
assessment — two S groups
successful — two C's, two S's

Double P and double T:

opportunity — two P's
appreciate — two P's
disappoint — one S, two P's
committee — two M's, two T's, two E's
battalion — two T's

Memory Aids for the Trickiest Words

Here are tested memory tricks for the double-letter words that 11+ students misspell most often.

accommodation — A hotel with enough room for two Comfortable Couples needs two C's and two M's: accommodation.
necessary — A shirt has one collar (C) and two sleeves (SS): necessary.
occasionally — It occasionally snows in England with a double-C cold snap: occasionally.
embarrass — You go Really Red (two R's) and feel So Silly (two S's): embarrass.
committee — A committee is too important for single letters: committee.
disappoint — One dis (single S), then appoint (double P): disappoint.
recommend — I really recommend this one: single C, double M.
occurred — The stress is on CUR, so the R doubles: occurred. (Both the C's and R's are doubled.)
possess — The word possesses four S's: possess.
successful — Two C's, two S's: successful.

Dictation Exercise

Ask someone to read these sentences aloud while you write them down. Each sentence contains at least two words where doubling matters.

The beginning of the story was gripping and unforgettable.
She preferred the accommodation that overlooked the garden.
The committee recommended a new approach to the problem.
He felt embarrassed after dropping his lunch tray.
It occurred to me that the answer was hidden in plain sight.
The successful swimmer admitted she had been terrified.
They were planning to visit the museum, but it was closed.
The fox was sitting quietly, occasionally flicking its tail.

Check your work carefully. Circle any double-letter errors. For each mistake, write the word correctly three times and identify whether the doubling rule or simple memorisation applies.

Pattern-Matching Quiz

For each word below, decide: does the final consonant double before -ing? Write your answer, then check.

Base word	+ ing = ?	Double?
swim	___________	Yes / No
rain	___________	Yes / No
hop	___________	Yes / No
visit	___________	Yes / No
begin	___________	Yes / No
open	___________	Yes / No
forget	___________	Yes / No
jump	___________	Yes / No
admit	___________	Yes / No
listen	___________	Yes / No

Answers: swimming (Yes), raining (No — two vowels), hopping (Yes), visiting (No — stress on first syllable), beginning (Yes — stress on last syllable), opening (No — stress on first syllable), forgetting (Yes — stress on last syllable), jumping (No — two consonants at end), admitting (Yes — stress on last syllable), listening (No — stress on first syllable).

For related spelling patterns, try our guide to I Before E and other spelling rules or practise with our 30 commonly misspelled 11+ words.

Double Letter Spelling Rules for 11+ Students