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1:1:1 Rule When a one syllable word ends with one consonant right after a short vowel, double the consonant before adding a vowel suffix. (Vowel suffixes = -ed; -ing; -er; -est; -y) mad = 1 syllable✅. 1 short vowel ✅, 1 consonant following the vowel ✅ = 1:1:1 Double the consonant when adding the suffix = madder Build new words by adding different suffixes to the root word.