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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.
Detailed notes
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.
Quick revision
- 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.
Types of questions asked
Every way this subtopic shows up in exams — how to recognise it, the formula or logic to use, and a solved example.
Type 1: Stressed final syllable: doublevery common2 practice Q
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.
Example: Omitted / Ommitted / Omited / Ommited
Omitted — stress on -MIT, so the t doubles; the m stays single.
Type 2: Unstressed final syllable: no doublevery common2 practice Q
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.
Example: Developed / Developped / Develloped / Divelopped
Developed — stress on -VEL-, so the p stays single.
Type 3: Words with two sets of doublescommon2 practice Q
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.
Example: Possession / Posession / Possesion / Posesion
Possession — ss + ss; each distractor drops at least one double.
Type 4: Words with only one doublecommon2 practice Q
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.
Example: Necessary / Neccessary / Necessery / Neccesary
Necessary — one c, double s: 'one collar, two sleeves'.
Shortcut tricks
⚡ Stress decides doubling
Say the word. If the last syllable is stressed, double before a vowel-suffix (begin→beginning, occur→occurred). If not, don't (benefit→benefited).
⚡ Double-double checklist
Five words need TWO doubled letters: accommodate (c,m), committee (m,t), embarrass (r,s), occurrence (c,r), millennium (l,n). Count them.
⚡ Letter census
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.
Where students lose marks
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).
Practice sets — 12 questions
Sets of 10, mixed across the question types above. Each answer comes with a step-by-step explanation.
Topic test · 12 questions
Suggested time 6 min · wrong answers go to your mistake notebook automatically.