What are examples of indefinite articles?

Indefinite articles are words that refer to nonspecific nouns. In English, the indefinite articles are "a" and "an".

Here are some examples of indefinite articles used in sentences:

"a":

* I saw a cat in the garden. (We don't know which cat)

* He bought a new car. (We don't know which car)

* Can you give me a pen? (We don't know which pen)

"an":

* She ate an apple for lunch. (We don't know which apple)

* He wrote an email to his boss. (We don't know which email)

* I have an idea. (We don't know which idea)

Note:

* We use "a" before words that start with a consonant sound.

* We use "an" before words that start with a vowel sound.

Let me know if you would like more examples or have any further questions!