The easiest way to choose "a" or "an" is to look at the sound of the first letter in the word that follows, not its direct spelling. Vowel-type sounds use "an"; consonant types use "a". This article gives more detailed rules and examples.
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AnonymousHello, Lady Yofiel. If I'm not mistaken, the only difference between them is that "a" we use before consonant(e.g. a nose, a house) and "an" before vowel (an apple, an uncle).But! an hour; a European, a union, a one, an umbrella.