Grammar Rules: A or An?

Using "A" and "An"

J.C. Grant
The indefinite articles a and an are sometimes misused, most often when combined with words starting with an h or o. The grammar rules below explain how to use these indefinite articles correctly.

1. Grammar Rules: A or An?- Choose the indefinite article a before words that begin with consonant sounds, including words that start with vowels.

Consonants are letters other than vowels: b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, (sometimes y), and z.
The following words begin with consonant sounds and start with consonants: ball, car, door, fire, garage, horse, jar, kite, lantern, mop, nurse, pizza, queen, rose, sign, tiger, vase, war, xylophone, yacht, and zebra. Comparatively, one-time and one-sided are words that begin with a consonant sound (w) but start with a vowel (o).

The indefinite article a precedes all of the above words because each begins with a consonant sound: a ball; a car; a door; a fire; a garage; a horse; a jar; a kite; a lantern; a mop; a nurse; a one-time charge; a one-sided argument; a pizza; a queen; a rose; a sign; a tiger; a vase; a war; a xylophone; a yacht; and a zebra.

2. Grammar Rules: A or An?- Choose the indefinite article an before words that begin with vowel sounds, including words that start with consonants.

The six vowels are a, e, i, o, u (and sometimes y). The following words begin with vowel sounds and start with vowels: ape, apple, astronaut, eel, elephant, equestrian, idea, illness, image, ode, offer, opera, ulcer, uncle, and umpire. Contrastingly, honest and honor are words that begin with a vowel sound (o) but start with a consonant (h).

The indefinite article an precedes all of the above words because each begins with a vowel sound: an ape; an apple; an astronaut; an eel; an elephant; an equestrian; an honest person; an honor; an idea; an illness; an image; an ode; an offer; an opera; an ulcer; an uncle, and an umpire.

Source(s):

"Articles: A versus An," Purdue Online Writing Lab, Purdue University.
"Indefinite Articles," Oxford Dictionaries.

Published by J.C. Grant

A writer interested in education, finance, health, history, law, music, polemics, politics, satire, sports, statistics, travel, and trivia.  View profile

10 Comments

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  • Linda Louise Johnson10/21/2010

    I am now officially admitting my brain blip in my comment about xylophone. Of course it IS pronounced like a Z -- J.C. you're right. I don't know what I was thinking. A xylophone!! Duh.

  • Randy Inman10/21/2010

    Thanks for the grammar tips!

  • Carol Whyte10/21/2010

    I think you're writing these grammar lessons for me, JC (LOL!!!) I need 'em!

  • Michele Starkey10/21/2010

    Thanks for the grammar lesson :) cheers

  • R. K. LoBello10/21/2010

    Great job on this, J.C.!

  • Sheryl Young10/21/2010

    You should make this a series! Grammar is going out the window these days. Besides, I know nothing about football, so I have to comment on your other stuff! LOL.

  • Abby Greenhill10/21/2010

    Great reviw - so many people get this one wrong!

  • Major Jester10/21/2010

    Great article J.C. When deciding on the use of "a" or "an" I guess I have always just gone with what "sounds best".

  • J.C. Grant10/20/2010

    Thanks for the comment, Linda. You made me pause. "Xylophone" begins with a consonant sound (z)--z with a long i. Therefore, it would be "a xylophone." By contrast, it would be "an X-ray" because that begins with a vowel sound (ex).

  • Linda Louise Johnson10/20/2010

    Great topic and good article! I'm surprised about xylophone though -- it does begin with a vowel SOUND - "ex." We wouldn't say "a exiled prisoner, we would say "an exiled " We would also say "an xylophone," don't you think?

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