Usually the way to know how to use "a" or "an", is by looking at the first letter of the word that comes after "a" or "an". If the first letter of the word is a vowel, then we use "an". If the first letter is a consonant, then we use "a", but why do we say "an hour" instead of "a hour"? or "a union" instead of "an union"? or "an honest" instead of "a honest"? Can someone please enlighten me. :sweat_smile:
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