A and An


A” and “an” are indefinite articles in English, and their use depends on the sound that follows them. The basic rule is:

Use “a” before words that begin with a consonant sound:

  • a car, a book, a dog, a book, a log

Use “an” before words that begin with a vowela,e,i,o,u’ sound:

  • an apple, an hour, an honest person, an orange, an ape

It’s important to note that it’s about the sound that follows the article, not necessarily the letter itself. For example:

  • Use “a” before words that begin with a pronounced “h” (consonant sound): a house, a hat
  • Use “an” before words that begin with a silent “h” or a vowel sound: an hour, an honest person

Here are some examples to illustrate:

  • “I saw a cat in the garden.”
  • “She has an interesting idea.”
  • “He bought a new car.”
  • “I’d like an orange, please.”
  • “She found a key under the mat.”
  • “There’s an elephant at the zoo.”

Remember that the choice between “a” and “an” is based on the sound, so it might not always align with the first written letter of the following word.


Test yourself

a or an?

Fill in the blank in each sentence with either a or an. 


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