7. Doubling Final Consonant—Words of More Than One Syllable. If a word has
more than one syllable and the accent is on the last syllable, the same rule applies
as for a one-syllable word.
commit + ed = committed
(The accent is on the last syllable t is doubled.)
control + ing = controlling
equip + ed = equipped
propel + er = propeller
What happens if the word is not accented on the last syllable?
refer + ence = reference
(The accent is not on er; r is not doubled.)
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