Spelling Rules.

When adding an ending to a word that ends in a consonant, we double that consonant when the ending begins with a vowel and the last syllable of the word is stressed and that syllable ends in a single vowel followed by a single consonant.

However, we don't double the consonant,
1. when it is a y or w (eg. enjoy)
2. when the last syllable is not stressed (eg. disCOver, LISten, HAppen)
But note also that we double the l at the end of verbs, when the last syllable is not stressed (eg. TRAvel, CANcel).

You may have a look at the PowerPoint presentation made by Charles Darling, PhD, Professor of English and Webmaster (Capital Community College, Hartford, Connecticut).

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