Use an before words that begin with a vowel sound and words that begin with a silent h:
- an enemy
- an heir
Use a before a consonant sound, including a pronounced h:
- a hero
- a union
Remember, it depends on how it is pronounced. Although union starts with a vowel, it is not pronounced with a vowel sound: you-nee-on.
The same rules apply before abbreviations and acronyms.
- an SS office
- a WSQ questionnaire
- an OPQ report
For more on articles, have a look at the Owl.
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