Rule 1: Consonant - Vowel - Consonant (CVC)
- When a one-syllable word is spelled with a consonant-vowel-consonant (CVC) pattern, the last letter should be doubled when adding the endings, -ing or -ed
Rule 2: Two-Syllable Words
- When the pronunciation of a two-syllable word is stressed on the second syllable, the last letter in the word should be doubled when adding the endings, -ing or -ed.