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🔒 Log in to trackDoubling consonants and one-letter betrayals
🔒 Log in to trackWhen does the final consonant double before a suffix? Three conditions, all true:
- The word ends consonant–vowel–consonant (CVC: begin, occur, refer).
- The suffix begins with a vowel (-ing, -ed, -ance, -ence…).
- The stress falls on that last syllable (beGIN → beginning; preFER → preferred).
If stress is elsewhere, no doubling: BENefit → benefited (one t), VISit → visited, TARget → targeted, ANSwer → answered.
Doubling and one-letter traps
| Correct | Trap spelling | Hook |
|---|---|---|
| accommodate | room for double c AND double m — the biggest room in spelling | |
| occurrence | double c, double r, then -ence | |
| occurred | occur → occurred: double r, single-ended | |
| committee | double m, double t, double e: com-mit-tee | |
| embarrass | double r and double s: em-barr-ass | |
| beginning | be-GIN → beGinning: the g doubles (gin is stressed) | |
| planned | plan → planned (planed means smoothed wood) | |
| referring | refer → referring: r doubles | |
| preferred | prefer → preferred: r doubles | |
| controlled | control → controlled: l doubles (British) | |
| benefited | benefit → benefited: only ONE t (stress not on -fit) | |
| targeted | target → targeted: ONE t | |
| visited | visit → visited: ONE t | |
| answered | answer keeps its w: an-swer-ed |
The fixed doubles — words where the doubling is simply part of the word: accommodate (c+m), committee (m+t+e), embarrass (r+s), occurrence/occurred (c+r), millennium (l+n), questionnaire (n), silhouette (t), parallel (one r, double l in the middle, single l at the end).
Benefited/targeted/visited are gold: papers plant 'benefitted' and 'targetted' as plausible options, and they are always wrong.
Why the consonant doubles
Doubling protects the short vowel. In 'hoping' the single p leaves a long 'o' (hope); in 'hopping' the double p keeps the short 'o' (hop). English applies the same idea to longer words, but only when the last syllable is stressed:
- om-IT -> omitted, omitting
- re-GRET -> regretted, regrettable
- ad-MIT -> admitted, admittance
- trans-FER -> transferred, transferring
- com-PEL -> compelled
- for-GET -> forgotten, forgetting
When the consonant does not double
If the stress is on an earlier syllable, add the suffix directly:
- DE-vel-op -> developed, developing
- BUD-get -> budgeted
- PROF-it -> profited
- LIM-it -> limited
- GAL-lop -> galloped
- OF-fer -> offered; HAP-pen -> happened The consonant also stays single if the word ends in two vowels + consonant (rain -> rained, cool -> cooled) or two consonants (help -> helped), or if the suffix starts with a consonant (commit -> commitment, regret -> regretful).
Stress can move
Watch words where the stress shifts in the longer form: re-FER -> re-FERR-ing, but REF-er-ence has only one r; pre-FER -> pre-FERR-ed, but PREF-er-ence and PREF-er-able. Say the new word, not the old one.
Words that simply have double letters
Some doubles have nothing to do with suffixes — they are just part of the word. Learn these by counting:
- Two or more sets of doubles: accommodation (cc, mm), possession (ss, ss), address (dd, ss), success (cc, ss), assassinate (ss, ss), committee (mm, tt, ee), embarrass (rr, ss), millennium (ll, nn).
- One set only: necessary (one c, double s), recommend (one c, double m), tomorrow (one m, double r), harass (one r, double s), occasion (double c, one s), parallel (one r, double l in the middle, one l at the end), dilemma (one l, double m).
A letter-count routine
For a double-letter item, write each option's doubles in the margin: necessary = c1 s2; neccessary = c2 s2; necesary = c1 s1. Compare with the pattern you know. This takes about ten seconds and catches mistakes you would miss by just looking at the word.
British forms in the exam
Indian exams follow British spelling. In British English, words ending in a single vowel + l double the l before a vowel suffix whatever the stress: travel -> travelled, cancel -> cancelled, label -> labelled. American English uses travel -> traveled. If an item offers only one of these as the answer, choose the British form.
Question types you will see
Each type: how to recognise it, the method step by step, and one question to try.
Stressed final syllable: double
A base ending in one vowel + one consonant (omit, regret, transfer) takes -ed, -ing or -able; the options differ in single vs double.
Say the base word and find the stress: om-IT, re-GRET.
If the last syllable is stressed and the suffix starts with a vowel, double the consonant.
Do not double any other letter (the m of omit stays single).
Why it works: doubling keeps the stressed short vowel short.
Omitted / Ommitted / Omited / Ommited
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Omitted — stress on -MIT, so the t doubles; the m stays single.
Unstressed final syllable: no double
The base is stressed on an earlier syllable (DEvelop, BUDget, PROFit) and a double-letter option looks tempting.
Say the base: DE-vel-op, BUD-get.
The stress is not on the last syllable, so add the suffix directly.
Reject every option with a doubled final consonant.
Why it works: with no stress on the last syllable there is no short vowel to protect.
Developed / Developped / Develloped / Divelopped
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Developed — stress on -VEL-, so the p stays single.
Words with two sets of doubles
The word is from the two-sets list: accommodation, possession, address, success, assassinate.
Count both sets of doubles: accommodation = cc + mm.
Remove any option that has only one set.
Check the ending last (-tion, -sion).
Why it works: distractors usually keep one double and drop the other, so a quick count finds them.
Possession / Posession / Possesion / Posesion
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Possession — ss + ss; each distractor drops at least one double.
Words with only one double
The word is often over-doubled: necessary, recommend, tomorrow, harass, occasion.
Recall which letter doubles: necessary -> s only; recommend -> m only.
Remove options that double the wrong letter or both letters.
Check the vowels last (necessary, not necessery).
Why it works: this group is tested by adding a double where there is none.
Necessary / Neccessary / Necessery / Neccesary
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Necessary — one c, double s: 'one collar, two sleeves'.
Shortcuts that save time
Say the word. If the last syllable is stressed, double before a vowel-suffix (begin→beginning, occur→occurred). If not, don't (benefit→benefited).
Five words need TWO doubled letters: accommodate (c,m), committee (m,t), embarrass (r,s), occurrence (c,r), millennium (l,n). Count them.
In the options, count the repeated letters. accommodate must show 2 c's and 2 m's; embarrass 2 r's and 2 s's. Eliminate on census failure.
Mistakes to avoid
Where most students lose marks on this subtopic.
Writing 'benefitted' by analogy with 'preferred' — benefit is stress-initial.
One double in 'accommodate' (accomodate / acommodate) — both doubles required.
Writing 'ocurrence' — the c doubles AND the r doubles.
Spelling 'planed' for 'planned' — planed is a different word (smoothed wood).
Quick revision
Read this the night before the exam.
Double only when the last syllable is stressed and the suffix starts with a vowel: omitted, regrettable, transferred.
Stress earlier -> no double: developed, budgeted, profited, limited, galloped.
Say the new word: reference and preference have one r.
Learn by count: accommodation, possession, address, success; necessary (1 c, 2 s), recommend (1 c, 2 m), tomorrow (1 m, 2 r), harass (1 r, 2 s).
British: travelled, cancelled, labelled.
Practice: 12 questions
Sets of 10, mixed across the question types above. Every answer has a step-by-step explanation.
Topic test · 12 questions
Suggested time 6 min · wrong answers go to your mistake notebook automatically.