Use "a" when the next word does not start with a vowel. Use "an" when it does...a very exciting time...An egg for breakfast...Remember that the sound of the word following the article (a or an), NOT...
It's more properly, when do you use a instead of an. The indefinite article in English is an. The n drops off before a consonant sound, giving a. The n remains in front of a vowel sound. This is...
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