One vowel + one consonant
hop → hoppingIn short words with one vowel and one final consonant, double it.
run → running; sad → saddest; big → biggerTHE SPELLING NOTEBOOK · 05
Running has two n’s, but raining has one. Three checks tell you when to double.
Try a little practice ↓THE RULES, ONE AT A TIME
In short words with one vowel and one final consonant, double it.
run → running; sad → saddest; big → biggerIn longer words, double only if the last syllable is stressed.
forget → forgetting; admit → admittedIf the stress is not on the last syllable, don’t double.
open → opened; garden → gardeningTwo vowels before the consonant, or two final consonants, mean no doubling.
jump → jumping; cool → coolerNever double w, x or y: snow → snowing, box → boxing, play → playing. A suffix starting with a consonant never causes doubling: sad → sadness. British English also doubles a final l after one vowel even without stress: travel → travelling (American English: traveling).
A LITTLE PRACTICE GOES A LONG WAY
Use the rules above, then check your answers.
Rules summarised from the Department for Education’s English spelling appendix. Examples and practice are original site copy, checked against the ENABLE2K word list. Spelling rules have exceptions; check unfamiliar words in a dictionary.