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The rule which applies to vomiting is that it the base word contains two syllables (vomit) with the accent on the first syllable and the last syllable ending with a single consonant preceded by a single vowel. Contrast the word vomitwith the word occur, which is accented on the second/last syllable and which, therefore, must have the final consonant doubled before a suffix can be added. Vomitbecomes vomiting; occur becomes occurring. The secret is in the vowel-consonant ending and with the placement of the accent.

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12y ago

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