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Use "a" when the noun you are referring to begins with a consonant.

Use "an" when the noun you are referring to begins with a vowel.

Pronunciation changes this rule

If the next word begins with a consonant sound when we say it, for example, "university" then we use a. If the next word begins with a vowel sound when we say it, for example "hour" then we use an.

We say "university" with a "y" sound at the beginning as though it were spelled "youniversity".

So, "a university" IS correct.

We say "hour" with a silent h as though it were spelled "our".

So, "an hour" IS correct.

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Q: What is the correct phase when using the word an or a in front of another word?
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