How would you use the word courier in a sentence?
The courier had just brought us a letter when we started to eat dinner.
Courier basicly means messenger.
You use the word "an" when you are would usually use the word "a," only you're describing a noun that starts with a vowel or a vowel sound. For example: I have no idea how I would use this word in A sentence. I would like to eat AN apple. I have AN hour to get to my train. My last card was AN ace. I would like to have A manatee as a pet.