Learner uses a or an on first mention of a singular countable noun, and chooses between them by sound rather than by letter.
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Six sentences where the first letter and the first sound disagree.
My brother works at a college. He is ______.
The sound rule, the say-it-aloud test, and the article every job needs.
Use an before a vowel sound. Use a before a consonant sound.
The letter does not decide. The sound does.
university you say "yoo" consonant sound → a university
hour you say "ow" vowel sound → an hour
MBA you say "em" vowel sound → an MBA
European you say "yur" consonant sound → a European
honest you say "on" vowel sound → an honest answer
Five words where the mouth and the spelling disagree.

The mouth chooses the article, not the first letter.
Three worked chains. Name the sound before you choose the article.
1. hour
The first sound you say is , and that is a sound.
So the article is hour.
2. university
The first sound you say is , and that is a sound.
So the article is university.
3. MBA
The first sound you say is , and that is a sound.
So the article is MBA.
Eight sentences. Six introduce something new. Two refer back.
My sister is engineer at a car factory.
It takes hour to reach the airport by bus.
They are building university on the edge of the city.
He showed me X-ray of his hand.
I bought a bicycle last month. bicycle was cheap.
She lives on one-way street near the station.
My father is honest man.
We watched a film last night. film was very long.
One job, one new object. Say each noun aloud before choosing.
Sentence 1: say what a person does.
My sister is ...
Sentence 2: introduce something new.
I bought ...
Say each noun out loud before you choose a or an. Keep both sentences short.
Two sentences, one per line.
Write the noun only.
Say one word aloud and explain which sound gave you the article.