What are sentences with an?

You're asking for sentences that use the word "an". Here are some examples:

* "An apple a day keeps the doctor away." (This uses "an" because "apple" starts with a vowel sound)

* "I saw an interesting bird in the park today."

* "She gave me an encouraging smile."

* "He's reading an exciting new book."

* "There's an old house at the end of the street."

Remember: We use "an" before words that start with a vowel sound, not necessarily a vowel letter. For example, "hour" starts with a consonant letter (h) but has a vowel sound, so we use "an hour".