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Generally, "an" is used before a word that utilized a vowel sound - apple, octopus, insect and such. But just because a word has a vowel starting it does not mean "an" should be used before it. Like "unicorn" - although it starts with a vowel, has a Y sound to start. So "a" would be used. Another interesting exception is when writing abbreviations or initials. For example, when discussing a show on the network NBC, one should write "an NBC show" not "a NBC show" because the letter "N" is pronounced "enn". If one were to speak the words of NBC only then would it be correct to say "a National Broadcasting Channel show".

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17y ago

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