If a single-syllable word (for example, sad) ends with a consonant (d) preceded by a single vowel (a), double the final consonant before adding a suffix beginning with a vowel (saddest).
| tap | tapping |
| plan | planner |
If a multisyllable word (admit) ends in a consonant (t) preceded by a single vowel (i), the accent is on the last syllable (ad-mit´), and the suffix begins with a vowel (ed)—the same rule holds true: double the final consonant (admitted).
| occur | occurrence |
| refer | referring |
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