Thread:Koolboat01/@comment-30837385-20170926203113

https://www.englishpage.com/articles/a-vs-an.htm

The indefinite articles a and an:

'a' is used when the subsequent word starts with a consonant sound like a car, or a zoo etc.

'an' is used when the subsequent word starts with a vowel sound like an elephant etc.

This also applies to words that start with consonants or vowels that may contradict what many think to be the correct usage.

For example:

"a euro" is not "an euro" because starts with consonant sound (yu-ro)

Similarly, "an NPC" is not "a NPC" because it starts with a vowel sound (eN-Pee-Cee).

In summary, you determine which indefinite article is used by the SOUND at the start of a word and not the first letter itself.

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(P.S. I am not trying to belittle you but I just want you to know for future use) 