In English, we have no pronounced double letters, except when some elements are combined, as in bookkeeper , where we actually pronounce both /k/s even though there is no clear stop between them. Double letters are normally from the history or origin of the word. Some are also grammatical additions: literal ~ literally.
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Anonymous Why do we pronounce double letters once, not twice?We do that because double letters are used in English to indicate vowel quality, not consonant pronunciation.