Exception to the Rule
We use “a” before words that begin with a consonant sound, and we use “an” before words that begin with a vowel sound.
a / e / i / o / u
- It was raining, and I didn’t have an umbrella.
- I ate an apple and a sandwich for lunch.
- A rabbit is an animal.
- He went to the bank an hour ago.
- She wants to go to a university in Colorado.
- He would rather buy a European car than an American car.