Using “a” and “an” Before Words

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Raphael asks: When should I use “a” and when should I use “an” before the different words? For example, should I say “a hour” or “an hour?” I stumble over this everytime and dont’t know if I’m getting it right, as I’m not speaking and writing English natively.

The Rule

The rule states that “a” should be used before words that begin with consonants (e.g., b, c ,d) while “an” should be used before words that begin with vowels (e.g., a,e,i). Notice, however, that the usage is determined by the pronunciation and not by the spelling, as many people wrongly assume.

You should say, therefore, “an hour” (because hour begins with a vowel sound) and “a history” (because history begins with a consonant sound).

Similarly you should say “a union” even if union begins with a “u.” That is because the pronunciation begins with “yu”, which is a consonant sound.


Deciding which version you should use with abbreviations is the tricky part. First of all you need to understand if the abbreviation is pronounced as a single word or letter by letter.

While we say “a light-water reactor,” the abbreviation is “an LWR.”

Similarly, you should use “an NBC reporter” (because “NBC” is pronounced “enbisi”) and “a NATO authority” (because “NATO” begins with a “ne” sound).

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83 thoughts on “Using “a” and “an” Before Words”

  1. I never knew that the usage of ‘a’ and ‘an’ depends on pronunciation. And I really like your blog … keep up the good work. 🙂

  2. Thanks Rohit. In fact this is the first post answering “readers’ questions.” If you have any feel free to ask us!

  3. Daniel,
    Nice, clear explanation of a/an.

    Question: did you mean to write “yo” to represent the “y” sound in “union”?

    It’s tricky to represent sounds without using the phonetic alphabet, but I think something like “yuh” would be closer to the consonant sound of the letter Y.

    Hmm, come to think of it, most of us pronounce the “i” in “union” as if it were a consonant “y.” How would we spell that phonetically? Using a capital U to represent the long sound of “u,” maybe

  4. Maeve, thanks for taking the lead regarding the phonetic alphabet.

    I tried to research a bit, but indeed “yu” is closer to what I was trying to express :).

  5. I’ve been wondering about this for a while, and why is ‘historian’ after ‘an’?
    It doesn’t start with a vowel sound, and yet all my history text books, articles etc use ‘an’…
    Or is that wrong?

  6. rich, here is the answer for your questions (it comes from Wikipedia):

    “Some words beginning with the letter h have the primary stress on the second or later syllable. Pronouncing a as a schwa can diminish the sound of the schwa and melt into the vowel. Pronouncing it as a “long a” does not do this, but as the pronunciation cannot be prescribed, the word is spelled the same for either. Hence an may be seen in such phrases as “an historic”, “an heroic”, and “an hôtel of excellence” was the by-line in an advertisement in a New York City newspaper”

  7. I think you are right to say we use “an” depends on the sound.

    But, ‘u’ is a vowel, not right to say it has a consonant sound. “u” can make three sounds as in up, unit, put, which are short vowel, long vowel, and the third sound respectively

    We may say: use “an” before a word that begins with a short vowel sound?

  8. Leah, I am not an expert with the phonetic alphabet, but it looks like “union” begins with a “yu” sound, and not a “u” one.

    I will research a bit and post what I find here.

  9. Glad I found this blog (through Yaro).
    Where does the word ‘hotel’ fit in though. I have seen it written(and pronounced) as ‘an hotel’ where the ‘h’ is not sounded and ‘a hotel’ where it is.

  10. Become a hero. Hero does not begin with a vowel sound; it begins with the consonant sound for H. The same should apply for hotel too. If you said hotel by itself and didn’t pronounce the H, it would sound like “otell”. That cannot be correct. I think it should be “a hotel” as in “a hoe tell everybody”!

  11. Articles usage is something I’ve mastered 🙂

    I was confused earlier about what article to use before Abbreviations, now it’s all clear, thanks to our teachers 🙂

  12. your blog gives lotz of basic knowledge which most people doesn’t know. i really appreciate your efforts. all the best.

  13. Back then all I know was “a union” and “an hour” which used the exception of using “a” and “an” before words. It depends on how it pronounced. And now I know that “an NBC” and “an LWR” are also using the same exception. Thanks!

  14. Here is a good one: “Cindy has a MAT in Elementary Education” or “Cindy has an MAT in Elementary Education.”

    The answer depends on how you say it.

    I say it is “an MAT” because I am assuming that when you say the title you say each individual letter (M-A-T), like you would with MBA. But, a friend was saying it like the word “mat” and thought it was “a MAT.” To get the right answer, you need to know if people say each individual letter, or do people sound it out and say “mat.” Is anyone familiar with MAT and how you say it? It makes all the difference.

  15. It is very clear explaination. I just know the using “a” or “an” . It not depends on vowels or consonants but also pronunciation.
    And would like to hear you more about “a” and “the”

  16. Daniel, what do you think about an E-Mail? I’ve seen “a”, “an”, and nothing at all. I usually use “an”, but please, correct me, if I am wrong.

  17. geee….

    So far i went wrong when taught student in elementary school. I always thought that, an–> always followed by vowel.

    Lucky me, because i find this explaination.

  18. Even though I try to make myself understand, i still have a doubt on the rule about the word “union”, what I mean to say is that anyone can be mistaken thinking that union starts with U and not with yu, so there can be many such mistakes by the children relating to this rule,so I suggest you to give the examples giving more clear hints. I think it can help me a bit more. I will be pleased if you can answer me. thanks

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  22. A question. If you are using an abbreviation that you expect people to look at and pronounce the actual word it represents in their mind and not pronounce the letters of the abbreviation would you base the a/an article on what you expect the reader to think in their mind or be strict and go by how the letters of the abbreviation would sound. I think it is most natural to use what the sound the reader is probably imagining in their mind.

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  24. Hi
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  27. While we say “a light-water reactor,” the abbreviation is “an LWR.”

    Similarly, you should use “an NBC reporter” (because “NBC” is pronounced “enbisi”) and “a NATO authority” (because “NATO” begins with a “ne” sound).

    this is a contradiction to what you’re stating. Please explain this one, because the LWR doesn’t sound like a vowel to me.

  28. @Wyatt, LWR starts with an “l”. I am not good at the phonetics alphabet, but that sound is similar to “ehl.” Do you see why it is a vowel sound?

  29. Wyatt, in common usage, NATO is pronounced as a word. ‘Nay-toe’. So the ‘A before consonant’ rule applies.

    LWT is an acronym, just like NATO, but it doesn’t look like a word, is not a common English word, so it is spelled out when pronounced. Ell-double-You-Are. The leading L is a consonant, true, but when you pronounce ‘Ell’ you have a vowel sound. Thus, ‘An before a vowel sound’.

    The rule goes by the sound of the word, not the strict classification of the first letter, whether that first letter is a vowel or a consonant.

    You noticed that the examples of ‘hour’ and ‘history’ require one to recall that when spoken, the leading ‘H’ of hour is silent, ‘hour’ is pronounced the same as ‘our’. Both ‘hour’ and ‘our’ expect an ‘An’ before it, since the rule applies to the spoken sound, in common usage.

    Another confusing term, like NATO, is ‘herb’, as in an herb garden, or garden herbs. Correct usage is to leave the ‘H’ silent, making it ‘an herb salad’. What gets confusing is the large number of people that mispronounce the word, making it sound like ‘Herb’ as in a short form of the name Herbert. If you are rattling off guy’s names, that would be a Sam or a Herb or a Willy. I have also heard the word “herb” pronounced “yarb”, which begins with a ‘Y’ sound, which common conventions agrees is a leading consonant sound. A herb (‘yarb’), a yes, a yellow spotted rhododendron – the ‘Y’ is a very versatile (or maybe just ambiguous) letter.

  30. I do understand about using an with the vowel sounds. but what about the apple, why an apple not a apple? Is it because of the difficulty in saying a apple compare to an apple?

  31. I do understand the rule of using a and an (with vowel sounds for the first letter of the word). My question is why the apple we use an apple not a apple? Is it because it’s difficult to pronounce a apple than an apple? Please give me a hint.

  32. suda, because the “a” in apple is a vowel and it makes a vowel sound, so you use “an” before vowel sounds. the vowels are: a,e,i,o,u and sometimes y. and for people older than 40 sometimes “w” ! but i’m under 40! so i don’t know why.

  33. thanks – I thought maybe the rule had changed since I was in school because I see the opposite usage of a and an so many times in newspapers – did newspaper style change or do they just get it wrong very often?

  34. I want to know about the examples,those are sentences those are starting with a with vowel

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