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Mispronunciation often causes the misspelling of words. Below are some common examples:
accidentally [al is often omitted]
athletic [e is often wrongly added- atheletic]
arctic [c is often omitted]
boundary [ a is often omitted]
candidate [d is often omitted]
children [ re is often reversed- childern]
disastrous [e is often wrongly added- disasterous]
everybody [ y is often omitted]
generally [ e is often omitted]
government [ n is often omitted]
hundred [re is often reversed- hunderd]
words ending in ing such as working [g is often omitted]
history [ o is often omitted]
laboratory [ o is often omitted]
liable [ a is often omitted]
library [ r is often omitted]
literature [ a is often omitted]
mischievous [ long-e is often wrongly added- mischievEEous ]
occasionally [ al is often omitted]
prefer [re is often reversed- perfer]
preserve [re is often reversed- perserve]
probably [ ba is often omitted]
strictly [ t is often omitted]
surprise [ r is often omitted]
temperature [a is often omitted]
usually [ u is often omitted

Be aware of how you are pronouncing words. Sometimes regional accents cause mispronunciations. There is nothing wrong with accents, except when they cause misspelling. I had to drop my southern accent many times during spelling and phonics classes in order to teach sounds and words accurately. Imagine my surprise when I discovered that the simple little word "on" is not supposed to be pronounced with a long "o" sound.