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🔒 Log in to trackDoubling consonants and one-letter betrayals
🔒 Log in to trackA final consonant doubles before a vowel suffix only when the word ends in vowel + consonant and the stress is on the last syllable. So begin becomes beginning, but visit becomes visited. Some words also carry fixed double letters, such as accommodate and committee. Count those letters.
The three conditions
The final consonant doubles when all three are true.
- The word ends in consonant + vowel + consonant (begin, occur, refer).
- The suffix begins with a vowel (-ing, -ed, -ance, -ence).
- The stress falls on the last syllable (be-GIN, pre-FER).
Results: begin, beginning. Prefer, preferred. Regret, regretted.
Rule: Say the word. Find the stressed syllable. If it is the last one, double the final consonant.
Why the letter doubles
Doubling keeps the vowel short. Hoping has a long 'o' (from hope). Hopping has a short 'o' (from hop). Long words follow the same idea 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: forgetting
When the letter stays single
If the stress is earlier, add the suffix directly.
- DE-vel-op: developed
- BUD-get: budgeted
- PROF-it: profited
- LIM-it: limited
- BEN-e-fit: benefited
- TAR-get: targeted
- VIS-it: visited
- OF-fer: offered
The letter also stays single after two vowels (rain, rained) or two consonants (help, helped). It stays single before a consonant suffix: commit, commitment.
Watch: Benefitted and targetted look natural. They are wrong.
Stress can move
The stress may shift in the longer word. Say the new word, not the old one.
- re-FER, re-FERR-ing, but REF-er-ence (one r)
- pre-FER, pre-FERR-ed, but PREF-er-ence
Words that simply have double letters
Some doubles are part of the word. Learn them by counting.
| Word | Doubles |
|---|---|
| accommodation | cc and mm |
| possession | ss and ss |
| committee | mm, tt and ee |
| embarrass | rr and ss |
| millennium | ll and nn |
| necessary | one c, double s |
| recommend | one c, double m |
| tomorrow | one m, double r |
| harass | one r, double s |
| parallel | one r, ll in the middle, one l at the end |
Tip: Write each option's doubles in the margin. For necessary: c1 s2. Then compare.
Three quick examples
- Begin ends in g-i-n, and the stress is on the last syllable. So beginning has two n's.
- Visit is stressed on the first syllable. So visited has one t.
- Occur is stressed on the last syllable. So occurred has two r's.
British forms
Indian exams use British spelling. A word ending in a single vowel + l doubles the l whatever the stress: travel, travelled; cancel, cancelled; label, labelled. American English writes traveled. Pick 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 ends in one vowel + one consonant (omit, regret, transfer) and takes -ed, -ing or -able. The options differ in single or 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 last consonant.
Do not double any other letter. The m of omit stays single.
Doubling keeps the stressed vowel short.
Omitted / Ommitted / Omited / Ommited
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The stress is on -MIT.
So the t doubles.
The m stays single.
Omitted
Unstressed final syllable: no double
The base is stressed early (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.
Add the suffix directly.
Reject every option with a doubled final consonant.
With no stress on the last syllable, there is no short vowel to protect.
Developed / Developped / Develloped / Divelopped
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The stress is on the first syllable: DE-vel-op.
So the p stays single.
Developed
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 has cc and mm.
Remove any option with only one set.
Check the ending last.
Wrong options usually keep one double and drop the other, so a count finds them.
Possession / Posession / Possesion / Posesion
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Possession has ss and ss.
Each wrong option drops at least one double.
Possession
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.
This group is tested by adding a double where none belongs.
Necessary / Neccessary / Necessery / Neccesary
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Necessary has one c and double s.
Neccessary and Neccesary have two c's.
Necessery changes a vowel.
Necessary
British single l: travelled, cancelled
The base ends in a single vowel + l (travel, cancel, label) and the suffix is -ed or -ing.
Check the last letters: vowel + l.
Double the l, whatever the stress.
Choose the British form.
Indian exams follow British spelling.
Cancelled / Canceled / Cancelld / Cancelted
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Cancel ends in vowel + l.
British English doubles the l.
So the word is cancelled.
Cancelled
Stress moves in the longer word
The options include both referring and reference style forms (preferred, preference, referring, reference).
Say the new word, not the base.
Is the stress still on the last syllable of the base? Then double.
If the stress moved earlier, keep the letter single.
The stress decides doubling, and it shifts in words like reference.
Preferred / Prefered / Preferrred / Prefferred
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Say pre-FERR-ed. The stress is on the last syllable of prefer.
So the r doubles.
The f stays single.
Preferred
Shortcuts that save time
Say the word. If the last syllable is stressed, double the consonant before a vowel suffix (begin, beginning; occur, occurred). If not, do not double (benefit, benefited).
Which is correct: benefitted or benefited?
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BEN-e-fit has the stress on the first syllable.
So the t stays single.
benefited
Five words need two sets of double letters: accommodate (c, m), committee (m, t), embarrass (r, s), occurrence (c, r), millennium (l, n). Count them.
Count the repeated letters in each option. Accommodate must show two c's and two m's. Embarrass must show two r's and two s's. Cut any option that fails the count.
Mistakes to avoid
Where most students lose marks on this subtopic.
Writing benefitted or targetted.
The stress is early, so the t stays single: benefited, targeted.
Writing begining or refering.
The last syllable is stressed, so the letter doubles: beginning, referring.
Writing accomodate or comittee with one set of doubles.
Count both sets: accommodate has cc and mm. Committee has mm, tt and ee.
Doubling the wrong letter in neccessary or reccomend.
Necessary has one c and double s. Recommend has one c and double m.
Writing traveled when the options are British.
British English doubles the l: travelled, cancelled, labelled.
Writing prefference by copying preferred.
The stress moves in the longer word. Preference has one r after the f.
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 means 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 (one c, two s), recommend (one c, two m), tomorrow (one m, two r), harass (one r, two s).
British forms: 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.