A or An? Why “an hour” and “a university” Trip Children Up

16 October 2026 · by Larry

Your child writes “I waited for a hour.” Or “She goes to an university.” Or “He is an 8-year-old boy” and then, two lines later, “a 11-year-old girl.” The rule was taught in Primary 1, the answer on the worksheet was right, and these still slip through.

The reason is usually one sentence that nobody said out loud: a and an are chosen by the sound that starts the next word, not by the letter. Most of the time the two agree, so the shortcut “an goes before a, e, i, o, u” works and nobody notices it is a shortcut. The words where they disagree are the ones that cost the mark.

The rule, in two lines

• an goes before a word that starts with a vowel sound: an apple, an egg, an umbrella, an hour.
• a goes before a word that starts with a consonant sound: a book, a bus, a university, a one-dollar coin.

The reason for two words at all is ease of speaking. “A apple” makes you stop in the middle, so English slips an n in to join the two sounds. Say both aloud and the child can hear it: an apple flows, a apple stumbles. That is a better test than any rule: if it stumbles, it wants an n.

Four kinds of word that break the shortcut

1. A silent h. The word starts with the letter h, but the h makes no sound, so the first sound is a vowel: an hour, an honest girl, an honour, an heir. Most h words are not like this (a house, a hat, a hospital), because there the h is spoken. A child who has learned “an before h” from an hour will then write “an house”, so it is worth giving both groups together.

2. A u that says “you”. The word starts with the letter u, but the first sound is the consonant sound y: a university, a uniform, a unit, a useful tip, a European trip. Compare an umbrella, an uncle, an unhappy day, where the u is a real vowel sound. Same letter, opposite answer, and a child cannot tell them apart by looking.

3. A word that starts with a “w” sound. One is spelled with an o but begins with the sound “wuh”, so it takes a: a one-dollar coin, a one-day trip. This is the least common of the four in a primary school composition, but it turns up in money sums.

4. Numbers and letters said aloud. This is the one that matters most in Singapore. We say the name of the number or letter, and the name decides:

• an 8-year-old (eight), an 11-year-old (eleven), an 80-cent stamp (eighty), but a 7-year-old, a 9-year-old, a 10-year-old.
• an MRT station (“em”), an HDB flat (“aitch”, which starts with a vowel sound), an ECA (“ee”), an F on a test (“eff”), an SMS (“ess”).
• a PSLE paper (“pee”), a CCA (“see”), a PE lesson (“pee”), a U-turn (“you”).

The letters that take an when they are read aloud as a letter name are the ones whose name starts with a vowel sound: A, E, F, H, I, L, M, N, O, R, S and X. It looks odd on the page (F and H and M and N and S are not vowels), and a child who is going by the letter will get every one of them wrong.

The slip that has nothing to do with sound

One more mistake looks like a vowel problem and is not. The little word goes with the word right after it, which is not always the noun. So:

• an apple, but a red apple, because the word after the article is now red.
• a dog, but an old dog.
• a hour is wrong, but a long hour is fine.

A child who has learned the rule on short phrases like “an apple” will often keep the an when an adjective gets slipped in: “an big apple”, “an red car”. In a composition, where nearly every noun has a describing word in front of it, this is a common way to lose the mark. The fix is the same as before: say the very next word, and listen to its first sound.

Two related slips are worth knowing because they get mixed in. A and an only go with one thing, so “an apples” or “a books” are wrong whatever the first sound is: plural nouns take neither, and a word like homework or rice, which is not counted one by one, does not take either word. And a word the speaker has already mentioned usually switches to the: “I saw a dog. The dog was brown.”

Why a clever child still gets it wrong

A child who reads a lot has often heard an hour so many times that it simply sounds right. A child who learned from the “a, e, i, o, u” chant has only the letters to go on and will apply them confidently, and wrongly, to hour and university. So an error here says nothing about how bright the child is. It tells you which of the two methods the child is using: the ear, or the letter list.

It also helps to know that this is a spoken rule that happens to be written down. Many children write silently and never say the sentence. A child who reads it out in a normal voice can often correct an a/an mistake without being told, because the stumble is audible.

What helps

• Replace the chant with a question. Not “is the letter a vowel?” but “what is the first sound of the next word?” Have the child say the word alone, slowly, and listen.
• Keep a list of the troublemakers on the fridge. A short one: an hour, an honest, a university, a uniform, an 8-year-old, an MRT, an HDB. Add words the child has actually got wrong. Ten words learned from the child’s own mistakes beat a printed page of fifty.
• Read the sentence aloud, with the article. Out loud, it becomes a or an by ear. Some errors disappear at this step.
• Look for the word after the article, not the noun. When proofreading a composition, circle every a and an, then look only at the very next word.
• Practise short, mixed sets. Five words in a row that all start with the same letter teach the letter, not the sound. A mixed set (umbrella, university, uncle, uniform) makes the child listen.

What does not help

• Reciting “a, e, i, o, u” again, only louder. The chant is exactly what is producing “an university”.
• Correcting the sentence without saying the sound. “It’s a, not an” teaches one sentence; “university starts with a y sound, yoo” teaches all of them.
• Calling it careless. A child who writes “an hour” correctly and “a honest” wrongly is not being careless; one of the two is a word they know and the other is a word they are guessing.

A five-minute check you can do at home

Read these aloud one at a time and ask your child for a or an. Then ask why, because the explanation shows which method the child is using.

• We waited for ___ hour.
• My cousin is at ___ university in another country.
• He has ___ old red bicycle.
• She is ___ 11-year-old girl.
• We took ___ MRT to school.
• Please give me ___ one-dollar coin.
• I ate ___ big apple.

The answers are an, a, an, an, an, a, and a. The old red bicycle is the one to watch: an goes with old, the word right after it, not with bicycle. If she misses the first or second, it is the silent h or the “you” u; if she misses the fourth or fifth, it is numbers and letters said aloud; if she misses the third or last, it is the word-in-between slip; if she misses the sixth, it is the w-sound word. Usually one kind turns up more than the others, and that is the one to spend ten minutes on.

Where this fits

On StudyLab, A or An is a Primary 1 topic in the free English practice, and the question there is built around sound: the hint tells a child to use an before a, e, i, o, u sounds, and each answer comes with a one-line reason. The words in the tricky groups above are the follow-up to it, not a replacement. The English topics level by level shows what comes after, and your child’s own school workbook sets the order that matters for the term; the MOE English syllabus on moe.gov.sg is the official source.

Related: another small word that a spelling test never catches is in, on or at, and the sound-alike trap in their, there and they’re is the same idea: a child who knows the words and not the pattern. Once the small words are right, composition: when your child has nothing to write about is about what goes in the sentences.