This is one of my biggest grammar pet peeves.

See, “a” is supposed to be used when the next letter starts with a consonant: I took a trip.

“An” is supposed to be used when the next letter is a vowel: I have an objective.

I’ve seen people write “an history” too many times to count, and it drives me nuts. How do people not know what seems to be a simple rule? Although, now that I’m thinking about it, it might be because “h” is sometimes silent. Or it might just be the way people pronounce it when speaking.

Any thoughts on this? Do you have any grammar pet peeves?