How do you write a in different ways?

Answer 1

"A" in this case is referring to a single general thing. Such as, "I need to buy a car." You aren't describing a specific car, but a car in general. I might even be a truck or an SUV.

If you want to speak generally about a single thing, you might say, "I need to buy any car."

Also, if "a" comes before a word that has a vowel sound, you use "an" instead. Such as, "a car" but "an owl."