If a word of more than one syllable ends with a short vowel and one consonant,
• DOUBLE THE FINAL CONSONANT before adding a suffix that begins with a
vowel if the accent is on the last syllable.
• DO NOT DOUBLE THE FINAL CONSONANT if the accent is not on the last syllable or if the suffix begins with a consonant.
Double the Final Consonant
-ing, -ed -ence, -ent -ance -al
befitting abhorrence acquittance acquittal
befogged concurrent admittance transmittal
committing excellence remittance noncommittal
compelled intermittent transmittance
controlling occurrence
impelling recurrent
incurred
omitting -er -en -able
permitted beginner forbidden controllable
propelling propeller forgotten forgettable
regretted transmitter regrettable
submitting
Do NOT Double the Final Consonant
ENDING IN TWO VOWELS ACCENT NOT SUFFIX BEGINS
TWO CONSO- BEFORE THE ON THE FINAL WITH A
NANTS CONSONANT SYLLABLE CONSONANT
-ing, -ed -ing, -ed -ing, -ed -ment
consenting concealing benefiting allotment
converted contained blossomed annulment
demanding detaining differed commitment
diverted disdained gathered deferment
requesting refraining limiting equipment
subsisted remounted profited interment
supplanting restraining quarreling preferment
supported retained soliciting
transcending revealing summoned