Adding Vowel Suffixes

The document outlines three rules for adding vowel suffixes to words in English: 1. The 111 Doubling Rule specifies doubling the final consonant before adding a suffix if a one-syllable word ends in one consonant after one vowel. 2. The 211 Doubling Rule specifies doubling the final consonant before adding a suffix if a multi-syllable word with accent on last syllable ends in one consonant after one vowel. 3. The Silent e Rule specifies dropping the final silent e before adding a suffix. Several common vowel suffixes and example words applying the rules are provided.